Bsa .177 Imp Model D service, relube and new spring

[silva]

The bsa .22 supersport I've had on long term loan is going back to its owner as he's recently traded in for a new shooting friendly missis.
So thinking of getting a 43.5 inch Bsa Improved Model D back into tiptop shooting condition as I haven't got a hunting airgun at the moment.

I've got my own idea's, but what modern after market spring, possibly piston washer and relubing regime would you recommend to recommission the rifle, which though in good order with no wear to the mechancs, is dry and definately needs a spring.

Was sort of hoping for about 10.5 flbs whilst still remaining pleasant to shoot. Has anyone had any luck using synthetic piston washers as originality isn't an issue.

Have a spare stock which already has the faint crack around the locating plug, so was going to fit that which takes most of the worry out of shooting these old Bsa's.

Cheers