HK VP9 C02 airsoft. Lost magazine tightening screw.

Hello all. Long time observer but new to post. Would appreciate your help. I lost the co2 tightening screw for the magazine of my HK vp9. I’ve found plenty of places willing to sell me a whole new magazine but none yet that have the screw. I would almost buy the whole clip but there’s no guarantee there will be an included co2 tightening screw. I’d greatly appreciate any help getting pointed in the right direction.