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Jeff,
C.J.Watkis was the BAA Instrument Section Director at the time. I just felt uncomfortable offering up up the design from memory....
Remind me... why did you upgrade the adjusting bolt?
On both my spectroscopes the small balance spring just holds the grating ( similar to your mirror) against it's own weight and there's very little resistance to rotating the grating. I'm thinking of the possible difficulties in getting repeatable settings.... maybe the holding screw needs to be replaced with a small sleeved bearing....
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