Looking for some assistance before I dive too far in.

I've got a project No. 5 carbine I got a couple years ago and am finally getting back around to toying with. However, I've ran into a bit of a problem.

The screw that goes through the back of the trigger guard/bottom of the reciever is a mess. It appears someone's messed with it before, as half of the head is broke off and it looks like someone's drilled the back side (fortunately it looks smaller than the threads).

I've been hitting it with penetrating oil the past few days trying to get it worked in a bit before I start trying to fiddle with it.

Anyway, open to any suggestions that might help me get it out. Hoping the threads aren't boogered up, but I won't find that out until I get it out.
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