Try a torx bit that is what they were originally designed for. I that doesn't work try a left handed drill bit in a reversible drill.

i will jump in, tore mine acl and meniscus on 2-3
sugery on 3-9
used my patella to fix acl, the Dr started to explane what he was going to do and i about fell over an told him to just fix the damm...

skied both, had some great days at both, no lift lines, but they are small, if that is what you want you will have a great time if not i would skip them