Help with Esprit 100ED focusser - Sorted now (I think)

[teoria_del_big_bang]

I have a serious issue with my focusser that I think has been causing me issues probably since I obtained the scope as I have always struggled with auto focus.

When I took my Sesto Senso auto focusser off I noticed that if I move the coarse focus knob by hand I can very (very) easily move it a degree or two before I feel any resistance.
Now the focusser does move a small amount so the knob is working to an extent but if I let go of the knob then the focusser itself slips back to where it was (if winding it inwards) under the weight of camera, FW etc.

But what is worse is that the fine adjustment side does not move at all for this one or two degrees and only starts moving when I feel some resistance.
So under auto focus the fine adjustment shaft will need to rotate a fair amount before it even starts to move the focusser. Now I might expect a bit of backlash or similar but this is huge.

Video might show this better -- does anyone have any ideas how to adjust this out. I have seen several threads on Esprit focussers slipping on the fine adjustments but this is not really sliping as such but backlash, and lots of it.

 

 

Steve 

Edited August 24, 2021 by teoria_del_big_bang

[teoria_del_big_bang]

Stripped the focusser down and I think it is sorted, although not impressed with this mechanism to be honest.

Steve