add mechanical assembly page

[challenge-bot] / guide / hausner / 0-mechanical-assembly / 4-attach-motor-to-deck.ogv

diff --git a/guide/hausner/0-mechanical-assembly/4-attach-motor-to-deck.ogv b/guide/hausner/0-mechanical-assembly/4-attach-motor-to-deck.ogv
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Binary files /dev/null and b/guide/hausner/0-mechanical-assembly/4-attach-motor-to-deck.ogv differ