Hoping someone can help me resolve/identify an issue i have recently with my seneca aspen. I recently replaced all orings in my aspen (valves, piston, seals etc) and upon a pump test all was working perfectly (no 1700psi precharge in air tube). I also got a special fill probe sent out to me thanks to soupyyy. After precharging the front of the air tube to 1700psi, as per the assembly manual I tried 60 hand pumps to see if it would reach the recommended 3000psi (+/-300). I did this in 10 pump intervals. What I was noticing was a strange "twang" sound on each pump stroke as the pressure built up, and the pump became harder to pump and almost impossible to fully extend on the outward stroke.
I released all air (front precharg too), took the pump apart and found both 2.5 x 7.5 orings on the check valve were deformed. I also found that the "shoulders" of the copper valve were broken off inside the receiver (see image below)
My questions are:
Could this be what was causing the "twang" sound And resistance to the pump?
Can I still use the valve without the "sholders"?
If not how can I fix, or replace it?
Any help or advice would be much appreciated
PS gun works fine if filled by external pump and shoots fine. Just a real pain to keep hooking it to a pump after every 2-3 shots to keep in in the sweet spot.