Crosman parts and replacing Co2 seals?

My Crosman T4 needs a new piercing pin and I will replace the seal too.

The gun is not piercing the cartridges, just dimples them short of a puncture.

Q1. I have not been able to find the parts online, where can I ?

Q2 What tool do I need to remove the seal? looks like a wide flat blade.

How wide, thick, etc.?

Is this a tool that would be universal for this if I should get one for use on my other guns too?

I can also just take it in to B-B Supply locally here in MN, but thought I might give it a try myself.

This last time, it managed to puncture it, fired once very strong, then barely and then not at all for 10 tries. I had no choice but to carefully remove the cartridge fully charged. It of course gassed out and after removing it, I found that the bit of the end of the cartridge that is pierced out had evidently found its way back to the output of the cartridge and had replugged the hole!!!

I found the little circle laying in the stem/seal area when I pulled the cartridge assembly out.

Now it will not pierce and I think it just needs a new piercing pin, but I may as well replace the seal too while I am at it. I had experianced a poor puncture once before, but a retry was successful that time.

I will be interested in selling this gun after the repair, I just have too many that are alike and I need to thin the herd a bit… (HUH???? yeah I know.. LOL )

Thanks

Bruce / Revwarnut