There is a knurled ring, but it's too tight for fingers. To reach the ring on which the cross-hairs mount I will have to unscrew the eyepiece assembly (which independently focusses on the cross-hairs. Some of the nuts have spanner-holes in the end-face rather than the periphery.but the face-spanners I am familiar with extend out sideways, and I can only approach these axially, as with a forked screwdriver. Am I supposed to turn these with a tiny tommy-bar, or a pin-spanner made like a pair of tweezers with inwardly-pointing pins in the tips? It has many of what the book calls, "capstan screws", or similar nuts, basically a cheese-head with radial holes. I've read her and other places about replacing them, with spider web or unravelled silk fiber, so I think I can do it.īut I have questions about the kit of tools proper to work on this thing. save for one cross-hair plumb gone and other displaced. I just bought an old Brunson Model 50 theodolite or "mountain transit".
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