So thats good news then, glad the Mrs couldn't find the Trex in Morrisons today! I'll stick with what i've got and use no lube over the ball.

Will I need to use filler to get the ball nearer the top of the cylinder?, to be honest I just want to have fun with this session and worry about the finer points of accuracy later when I am used to the gun.

What the best way of avoiding compression Tac, I suppose it's being gentle with the rod as you shove it in, just like making love to a beautiful lady!