Jig for installation of threaded inserts into wood, instead of needing to use special tools.  Supports ¼-20 and 10-24 threaded inserts.

Extra things you will need for each side:
3.5" bolt, 2 nuts, 2 washers, spring 1.25" long.

The spring keeps pressure downward on the threaded insert.  See https://www.woodsmith.com/article/threaded-insert-jig/ for more info.