Shop-made Thread Cutting Tools for Wood. I don't know that I like the way this guy did it but it is a good idea.
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"T" Wrench for Inserts: This "T" Wrench is used to manually install a threaded insert straight and easy without damaging wood or fastener. It is long with a handle. Please note that this item is the T-Wrench only, threaded inserts are sold separately.