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Had another go at getting the spacing right on my Imaging Star 80
Some arithmetic on the spacing and making some assumptions about the thickness of components gave me a suggested spacing of 44mm from the end of the focuser.
The nearest I could get was 46mm, which is still a wee bit too long and there's a lot of tilt to sort out, probably with the Bahtinov mask. Oh, yes and a couple of horrendous dust spots and some localised gradients which I've tried to get rid of with flats, though not entirely successfully.
Total integration time 40min made up of 40 x 30sec and 20 x 60sec. Exposure took place as the sky was getting dark, and I think there were flecks of high cloud coming over as well, hence some of the gradients.