NavList:

I have recently bought a Link A-12 sextant on ebay - serial number 101. It appears to be in excellent condition, with no obvious damage to the gear train, index arm/mirror or vernier. The index arm moves freely throughout its range along the arc, with no binding or other signs of distress. The bubble assembly does not have the two knurled screws which are shown in the manual for retaining the assembly in the housing. Perhaps this was normal in the earlier production models. I have so far been unable to remove the bubble assembly, although I haven't made a really serious attempt to do so.
Unfortunately the instrument is in error by about 15 degrees.
I would appreciate any suggestions that might help me troubleshoot this problem.
Perhaps Dr Kolbe might respond? I bought the sextant after reading some of his posts and on-line papers about navigating in the Libyan desert.
I was a professional marine navigator and own C.Plath and Freiberger marine sextants, now occasionally used at sea. I have also owned a Mark IX bubble sextant for many years for use in Saudi Arabia in pre-GPS days, inspired by DN Hall's 'Simple method of Navigating in Deserts' from The Geographical Journal in 1967.
Any help with my new purchase would be much appreciated! (I am in the UK).
Thanks - this is my first post on this excellent forum.
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