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  <xsd:element name="EmployeeStockOwnershipPlanEsopFirstTierDiversificationPercentage" id="mec_EmployeeStockOwnershipPlanEsopFirstTierDiversificationPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="EmployeeStockOwnershipPlanEsopSecondTierDiversificationPercentage" id="mec_EmployeeStockOwnershipPlanEsopSecondTierDiversificationPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="DeferredCompensationArrangementWithIndividualAmountOfCompensationDeferred" id="mec_DeferredCompensationArrangementWithIndividualAmountOfCompensationDeferred" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="IncreaseDecreaseInDeferredTaxes" id="mec_IncreaseDecreaseInDeferredTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AccuFabMember" id="mec_AccuFabMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtInstrumentBasisSpreadOnVariableRateConsolidatedTotalLeverageRatio" id="mec_DebtInstrumentBasisSpreadOnVariableRateConsolidatedTotalLeverageRatio" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="FederalFundRateMember" id="mec_FederalFundRateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EquipmentRelocationMember" id="mec_EquipmentRelocationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AssetWriteDownMember" id="mec_AssetWriteDownMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="BusinessCombinationRecognizedLiabilityAssumedLeaseLiabilitiesCurrent" id="mec_BusinessCombinationRecognizedLiabilityAssumedLeaseLiabilitiesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="BusinessCombinationRecognizedLiabilityAssumedLeaseLiabilitiesNonCurrent" id="mec_BusinessCombinationRecognizedLiabilityAssumedLeaseLiabilitiesNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NumberOfWarehouses" id="mec_NumberOfWarehouses" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredOperatingLeaseRightOfUseAsset" id="mec_BusinessCombinationRecognizedIdentifiableAssetsAcquiredOperatingLeaseRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSalariesWagesAndPayrollTaxes" id="mec_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSalariesWagesAndPayrollTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSalariesBonusesAndDeferredCompensation" id="mec_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSalariesBonusesAndDeferredCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentLiabilitiesOther" id="mec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentLiabilitiesOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ThroughFourthQuarterOf2026Member" id="mec_ThroughFourthQuarterOf2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FirstAndSecondQuarterOf2026Member" id="mec_FirstAndSecondQuarterOf2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ThirdQuarterOf2026Member" id="mec_ThirdQuarterOf2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FourthQuarterOf2026Member" id="mec_FourthQuarterOf2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="Year2027AndThereafterMember" id="mec_Year2027AndThereafterMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SecuredOvernightFinancingRateSofrOneMonthTermMember" id="mec_SecuredOvernightFinancingRateSofrOneMonthTermMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ImpairmentOfLongLivedAssets" id="mec_ImpairmentOfLongLivedAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AssetsReclassifiedToAssetsHeldForSaleNotPartOfDisposalGroup" id="mec_AssetsReclassifiedToAssetsHeldForSaleNotPartOfDisposalGroup" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="LeaseImpairmentLoss" id="mec_LeaseImpairmentLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="FirstAmendmentCreditAgreementMember" id="mec_FirstAmendmentCreditAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalAssetsAcquired" id="mec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalAssetsAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalLiabilitiesAssumed" id="mec_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalLiabilitiesAssumed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
</xsd:schema>
