All Parts Should Go Together Without Forcing. You Must Remember That The Parts You Are Reassembling Were Disassembled By You.

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All parts should go together without forcing. You must remember that the
parts you are reassembling were disassembled by you. Therefore, if you
can't get them together again, there must be a reason. By all means, do
not use a hammer.
-- IBM maintenance manual (1925)

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