The screw you need is 1/4"-28 x 1" SHCS(socket head cap screw). The original grip screw has a 1-1/8" length and would be next to impossible to find, but the 1" length will work OK. Should be able to pick them up at any decent hardware store. If no luck there, check at a local fastener house. You will want 1/4" internal lockwashers to go with them. If you can't find them locally IM me and we can work something out. I've got them in stainless steel.