Fx impact air leakage through the barrel

How do you guys replace that part. I can't remove the delrin from the rod.

You are gonna laugh, I set the Delrin on fire, and let it burn up completely :) 

After that, it can be loosened without effort. Don't inhale the fumes!

Many thanks weatherby. Do you plan to sell PEEK seals? I kinda need 2 or 3 as spares.

Unfortunately not, I don't sell anything, just tinkering to the limit and sharing.

With a PEEK seal, you'll likely only need one.