Crosman 357 service

You're better off ordering the parts and fixing it yourself, it would save you money and time. The 357 is a fairly simple build that can be dismantled very easily. What part is broken on your pistol?
 
Does it leak from inside the gun where the valve is located or from the piece that pierces that co2 bulb? I can send you a replacement seal if you figure out what is at fault because I don't plan on fixing my 357 any time soon.
 
Could the seal just be dry?

Try putting a drop of Pelgun oil on the tip of the CO2 cartridge, then insert it and tighten the screw to puncture it.
 
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