Heat the entire gun up to toasty when you first charge it so the seals will be supple and the pressure will be high. I face off the seal and polish with 4 oooo steel wool. I chuck the head at the step or full length of head and make sure the run-out on stem is eliminated. Once the head is pressed together it can be trued and faced off to ready it for use. It is a good policy to use a permanent thread locker in the brass head for insurance. The seal fits in the brass head and you use a 1/8" hole in a hard plate to drop the long end of the stem in and drive the head and seal onto the stem. 125" deep recess will allow you to drive the stem out of the head when properly supported. 2" through hole in a steel plate centered in a. A propane torch can be very helpful to get the brass head to separate from the steel stem. This kit gives the DIY a good variety of components so he/she can rebuild all the Old School CO2 Crosman and modern QB & TF guns. Valve Stem Rebuild components for Professional Rebuild of the Crosman Old School & QB Exhaust valve Assemblies.
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