I pulled the bolster plate on a 30 ton Bliss press to repair the hold-down bolt holes. There are 21 inserts that are "T" shape with a minor dia. of 1.25" and the major dia. of the flange is 2", they are installed from the bottom and are drilled and threaded 5/8-11. I drilled them all out and threaded them 3/4-10. What happens is after only 20 years or so the 5/8-11 holes get boogered-up and stripped. sometimes the dies get changed 10 times a day. The 3/4-10 should last a LOT longer and hold better. I want to plug all the holes that aren't being used for that set-up so crap and little pieces of steel wire don't get in the hole and shorten the thread life and hamper easy set-ups.
I looked on the web and I'm NOT spending $3-5 apiece. I will cut threaded rod and grind or mill a slot for a screwdriver if I can't find a better solution. The plugs have to be easy and quick to remove and install and keep the spoo out. Any suggestions?