Hi Came across this while searching for a way of connecting the MPCC to the focuser without possiblity of tilt from using screws or compression rings. Due to the stupid undercut in the barrel it's extremely difficult to get a consistantly square mouting. This looks to be the solution, if you are using a Skywatcher draw tube anyway. https://teleskop-austria.at/index.php?produkt=FUFmpcc At 15 euros (26 delivered) it's worth a punt I thought.