Replacement Flipper for Extension Ladder

Extension ladders have aluminum rung locks so you can raise and lower simply by pulling a rope, and safely locking in place when the right height is reached. When lowering the extension, a pair of spring-loaded plastic "flippers" push the rung locks out of the way.

I recently acquired an old 32' extension ladder with a broken flipper and rather than buy a replacement kit, designed a flipper in OpenScad and printed a pair on my Printrbot simple. It works very well.

Installing these can be t