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Just to add to that. It has occurred to me this is what was happening with my system. It started off as little jumps about 6 months ago and then it got progressively worse until it would just slip. The focusor was so loose the pinion would slip out of the rack and this I think is what is happening with your system. The Tak focusor is very robust and can hold that weight, but any looseness in the focusor will lead to slipping such as this.
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