Not enough out focus Ken. I've taken the standard Crayford off and put on a WO 10:1 which has a shorter profile, but I think I've got it sussed now
I'll use a Meade 6.3 FR which should do the trick. I did it with the Celestron tonight and it worked a treat. (I just couldn't be bothered swapping scopes over as I was only doing a practice focusing run)