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Yup, drill speed is crucial depending on what material you are drilling out. The trick with bolt heads is low speed, medium pressure and, crucially, use cutting fluid to lubricate and cool it. Not easy when you’re drilling side-on and it makes a mess, but I got bollocked many times as an apprentice about the correct use of drill bits.
jj72
Thrustvector
Joseph or George suggested we try this since they changed the loctite compound - have yet to try. Have found you go through less drill bits thinif you drill really slowly with a lot of pressure on. (Even the supplied drill bits work when you do this but you need one per side)