Thanks for all the advice and suggestions, I took the mirror cell out and found that the mirror cell has 3 countersunk (glued?) machine screws coming out of the bottom of the cell( had to remove the mirror to access them . They would not budge and as the cell is very lightweight did not want to force them. I am now looking at getting a cylindrical thread extenders made that would move the mirror forward and still use the same springs. Now to find someone to make them!
Regards philip
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