Took it all apart this afternoon. We'll, everything except the valve. I don't have the special tool for that...and I think it unnecessary, it holds air and functions.
Watched a series of videos on YouTube that showed how to take all the guts out. Special trick getting the pump handle off the plunger so it can be removed and cleaned, etc. Made it easy-peasy.
Removed the trigger group, stoned the sear, lever and trigger contact points. Probably should have shortened the sear engagement 0.010" or so but for now, just getting the stamped edges clean made a big improvement. This thing isn't exactly Olympic level.
Oiled everything judiciously. Neats Foot oil (leather seals).
I did shorten the piston stroke 0.030". It was only coming back far enough to half-uncover the air hole. Pumping stroke is now slightly easier.
All back together, no issues, 6 pumps is still max. I think I'll try a washer or two under the hammer spring. Might get me a little more power. I'd like "as advertised" 550fps...