add mechanical assembly page

[challenge-bot] / guide / hausner / 0-mechanical-assembly / 1-b-motor-assembly-sans-wires.ogv

diff --git a/guide/hausner/0-mechanical-assembly/1-b-motor-assembly-sans-wires.ogv b/guide/hausner/0-mechanical-assembly/1-b-motor-assembly-sans-wires.ogv
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