The screws are 2-56. The length of the screws may be a problem. My S30V has a screw that only catches in some holes but not in others. By shifting them around I've managed to get all three to bite. However, if the threads were never put in or the holes are too big then the only solution is to go to a bigger size screw. Unfortunately that is a lot bigger unless you could access the correct size tap for one of the Chinese metric screws like those used in the Spyderco Tenacious. These are beefy little screws and actually my favorite screws over the 2-56. If I had access to these screws, and the taps and drills in the proper sizes this is what I'd be using in everything I make. I do not know the sizing of these screws though.
The liners may not be so easy to thread at all. Don't expect to just twist right through there haphazard like. You'll twist the tapper off and break it sticking it in there but good if you are not careful. Send it in for warranty work and don't play mechanic unless you know enough to get yourself out of a jam.
STR