Your time is wasted when you use inferior parts. If you use the parts that make for the most reliable repairs imaginable a DIY project can be the best investment you ever made in an airgun. Polishing the seat is often required to remove any scratches or abuse. Getting it to seal initially can be impossible if there is any seat irregularity. Making sure there is no damage to the valve seat where the seal sits is very important as the Mac1 seals are hard enough so you can leave the gun charged all the time. Heat the entire gun up to toasty when you first charge it so the seals will be supple and the pressure will be high. 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 anvil to drive the head and seal onto the stem. A propane torch can be very helpful to get the brass head to separate from the steel stem.
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Valve Stem Rebuild components and all seals for Professional Rebuild of the Crosman 600. floor jack seal kits at Floor Jacks for sale online.
