Thanks guys,
I ended up using a scalpel to lift the tuff off the grub screws, then used a fine syringe to put drops of acetone into the head. Kept doing this so it just overflowed the screw. Waited until the "varnish" softened and then was able to get them to move. Adjusted the focuser fine, however may hace to replace the screws as I had to use a bit of force to free them and may have partialluy stripped the hex......
All OK for now though...
cheers
Gary
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