Show us your home made tools

This is about as simple as it gets. A 2 foot piece of 2X4 with a large dado down the center. Back side has a short piece of electrical conduit glued in with epoxy.
How to use? Install on the floor jack, lay an old towel over it and set the door into the slot. It allows me to lift and hold the door in place while I fiddle around with hinge bolts.

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