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You're welcome Rod, I've had a lot of helpfull advice given by the folks on here and it's nice to return the favour.
I took the tube out of the focuser body and glued the shim inside with contact cement. I used brass shim, but a suitable thickness of plastic from a drinks container or similar would do just as well. It was put in in 2 pieces, the length of the focuser body on either side of the rack and clear of the plastic strip opposite. Turn the tube so the rack is uppermost while doing the mods as the plastic strip will fall out.
Not something I did, but it would be a good idea to check if the focuser is square to the tube and shim it if not. Has to improve the image.
Cheers
Bill
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