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Douglas

If you are sure that the index prism shaft anti-backlash spring is now working 
and that you have removed all end float from that shaft, I agree the source 
of your problem probably lies with the worm shaft assembly. The helical 
antibacklash spring for the worm shaft is relatively weak, so if the 
lubrication is no longer good, it may not be working. The assembly was never 
meant to to be taken apart and, indeed, attempts to do so are likely to bend 
something important. If it rotates freely and any end float upwards is 
smartly returned downwards by the spring, all is well (some units were fitted 
so well that no end float is detectable). If not, I suggest a little clock 
oil on the bearings, encouraged by gentle warmth, until the shaft rotates and 
slides freely. The assembly is dowelled to the frame, but it is just possible 
that a previous explorer has damaged the dowel holes and some movement of the 
whole assembly occurs, so check the three attaching screws are tight.

You are by now no doubt very familiar with the anatomy, but I am attaching a 
picture for those who are not.

Bill Morris
Pukenui
New Zealand

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