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may have found the problem, (thanks asimov, i have quickly some of the link and this sounds very similiar as i can't turn my focus in any further ).
The switch on the modified toucam sticks out a fairly long way, so when you put it along with its adapter into the focuser, the switch hits the focuser.
So having now cut this switch to 1/4 of its length with a pair of pliers and reinserted it, i have focus.
Unfortunately the clouds came in as I was starting to take shots, but got some star video of achernar
From reading asimov's link, a barlow may help, but i am going to be taking the switch off the front of the toucam and moving it somwhere to the back
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