S410 classic power difference

[airarmstommy]

Hey guys, my precious s410 was only puting out 8.1 ft/lbs so a friend of mine opened up the transfer port anti tamper and adjusted the 1.5mm hex. That seemed to do the trick but now the power is all over the place. It was reading 833 on the chrono with 8.44's and when the transfer port screw is turned down and reading 746 on the chrono, 10 jsb's later it is up at 784 on the chrono!!!!!
Please help as I really enjoy and want to keep this rifle

[Blackbaronfish]

Give the hammer rail a good clean and polish
They get a bit grubby.

BBF

[airarmstommy]

Thanks for the reply BBF,
I think I'll send it to air arms and have it serviced at the same time as they also replace the anti tampers once opened.