Benjamin valves in various states of manufacture. I machine off 1/2 20tpi bolt and drill and reem hole to 1/8th inch so that I can use a 1377 stem instead of the bulky Benjamin stem. The older stems pictured are hardened steel. I take the brass/teflon seat off and machine a new one out of delrin to replace it. Superior to the new teflon crap that crosman puts in their guns if you are willing to devote the time. If you have a mini lathe you should be able to do this. The valves are a package deal. I am selling them for $50 for everything in the picture.
Here is a price list for the next picture. Various odds and ends shown, including the stems mentioned before. Quantity is shown in parenthesis (_):
1377 hardened stem poppets $1.50 (16)
1377 rear cocking setup $15 (1)
c02 cartridge adapter $15 (1)
c02 Bottle/foster fitting adapter $12 (1)
Scope rings $12 per set (3)
Bushnell scope rings $5 (1)
Delrin rods great for making valve stems. For sale as a package for $25.
My phone is 360-279-1497 if you are interested. Call and leave a message.