How to fix a focuser that isn't moving properly

[crazzy88ss]

I have a Orion SkyQuest XT8 Classic Dobsonian with a 2" crayford focuser.  The focuser has stopped properly moving in its track; it's not really moving at all; it'll move a bit, and then gravity will make it drop back down. I have to focus by pulling or pushing the whole tube by hand.

I took off the plate and 4 screws that hold the adjustment wheel to take a look.  I don't see any issues with the wheel-bar or the flat part on the drawtube.  I reattached the plate and tightened the 4 screws; no change.  The thumb screw that locks the tube in place is working properly.

Any ideas? 

[Peter Drew]

Is there not another screw between the four plate screws?, if so, that one needs tightening slightly.

[RT65CB-SWL]

If it is of any help... Adjusting the Skywatcher Focuser.pdf

[fozzybear]

take a look at this Pdf it might help

SWN1507eq3_Skywatcher_Crayfor-Auszug_justieren.pdf

[fozzybear]

great minds think alike...

[fozzybear]

+ video to mod the drawtube from astroshed

 

 

[crazzy88ss]

Thanks guys.  There was a tiny allen-wrench screw hiding on the plate that I completely overlooked after disassembling everything twice.   That did the trick!