I am not exactly sure what screw you are talking about, but I am guessing it is the clean-out screw in the side of the bolster. I have replaced all of my screws with screws with a allen wrench head in them. They are much easier to get out with a snug allen wrench than a flatblade screw driver. I just went down to the local hardware store and puchased the screws - mine were 6x48 and I am thinking that yours might be a 10x32 - I do not have a CVA sidelock any longer so I can not even check for you. If you can get your current screw out takeit the the Hdwe. store and match it up with a hardened cap screw. Just a thought