The tx spring with all that preload I noticed was binding on the inside of the piston.
So refitted the titan no 10 running on the tinbum guide ,which incidentally needed a mate to turn a few thou off.
Wetted the spring with the merest hint of cheapo molly. The rear piston bearing got a smear of tb paste aswell.The outer comp tube got a smear of cd90 moly cote. The front of the piston seal was as clean as a whistle, with the seal walls grimy with the paste,so no action required there. Didn't put a front slip washer in as I remembered there was already a polished washer lurking down the bottom of the piston,so just the nylon top hat at that front end with no preload.
After a tin + of 7.9 aa express shot over the last couple of weeks , it was chronoed it last night,it's shooting at 10.7ftlb 780ish as consistent as one could wish for.So it's all done , i'll leave it all alone now
. Shoots fantastic with tb kit fitted.Just a note about aaf express 7.9 ,it's the best pellet for medium range/garden plinking but I have noticed at longer range,maybe 15-20 yards further out it actually got more consistent results with aaf8.4. A touch more recoil but..