Need to get a thread mill for live tooling 5/8 and 3/4 joint and butt tennons using a PC router with a 1/4 shaft limit? MICRO100 lists a 3/8 cutter diameter with a 1/4 shank. Is this the way to go? Kind of pricy so I would like to get it right the first time. I have dies but I dont like the results. Thanks for any feedback.