I don't think such a kit exists. If the gun is new enough Sheridan will do it but chances are if it's old enough to need it they won't. But if you'll contact them they will tell you who they sold all the parts to the older guns to. Problem is they don't sell the parts, they want you to send the gun in. Bigger problem, you can buy a new one cheaper than they will fix the old one. That's what I ended up doing after going down the road you're on now.