Thermoquad?

Good luck with drilling them out, if I were you, I find a competent machinist with expertise in that sort of thing.

I’m a retired tool and die maker and I also have a TQ base with a busted screws. My plan is to get the base plate hot in a pot of boiling water, repeating the process over and over, heating, cooling to try to soften up the corrosion. penetrating oil between heat and cool cycles. Then drilling out the jet with a left hand twist drill in a precision milling machine setup. That way if it loosens up while drilling it will back out. Drill with the base plate hot. Set a precision spindle stop and drill.01 at a crack.

If you do happen to get them out, you have to figure out the thread pitch in the hole to help you search for a replacement jet screw.