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Merlin66,
I replaced the adj. screw because the 1/4" threaded through a 3mm wall provided too much lateral movement. So I milled down a 1" thick block so that it could take a 10mm bolt and add lateral support. The spring is fairly stiff.
I would love to have a reflection grating to move instead of the mirror, maybe one day. I am investigating the use of an educational grating set, 100, 300 and 600 l/mm; allowing more flexability in resolution.
There may be some of the movement you describe as the rotating mirror bearing surface wears, I'm assumeing that it wouldn't be rotated all that often. Yet another problem that may develop and require a solution. Keeps the mind busy.
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