Figured it out anyway and like a wally I tried the Tape that came with it - what a rubbish process. Anyway I have now printed spacers for all my scopes, and they work superb rock solid and perfect.

So to help everyone else out (in the UK) I have printed loads and put them on Ebay

Also I have recycled a Ebike battery which had 45 18650 Cells in it and only 10 were dead - so the other 35 work great and store 4.2 Volts on 2200MaH and 8.14Wh

So I am giving one away with each spacer I post out!!!

I have loads of footage so far from working on a local farm with my .222 Steyr/schmidt&bender, but yet to try it on my air rifles - probably when the rats move back indoors in the autumn....