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Mount stripped and checked. It has the bearings fitted and the grease looks like it was White Lithium and not overdone, but cleaned and replaced it anyway. Adjusted the worm to take up backlash and it has minimum now and feels very smooth and free with no tight spots. Tweaked the balance and it can now be put in any postion with the lock off and it stays there. I had the push on knob on the short end of the worm shaft and it looks like it could have been dragging against the adjusting nut, moved it to the other end. The locking screw for the RA setting circles at the back of the mount will also put a drag on the shaft if its overtightened. Test proceeding, and hopefully all should be well.
Thanks for the advice guys.
Cheers
Bill
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