Scope focusing tube slips when at zenith

[Fay]

My 120 is a nightmare for the above. If the locking screw is tight then you cant focus & if it is loose, it slips while trying to focus. or if I have focus & then tighten the locking screw, it puts it out of focus again.

Has anyone a remedy, before I reach for the hammer?

Thanks

[MarkS]

Could you focus it then tighten the locking screw to prevent slippage?  If you need to subsequently refocus then loosen the locking screw slightly.

This is exactly what I have to do on the Bananascope.

[Fay]

Yes, i do focus then tighten the screw again, but it puts it out of focus again, as I tighten it. i think I will have a good look at it, & see if any of the other screws do anything. it seems like it is not gripping inside

[Carole]

Oh dear, I feel for you Fay.  I used to have the same problem with my first scope the Megrez 72 it was a PITA, especially as I was a real beginner then.  Mine used to slip in any position.  I had to tighten the drawtube, but then it ended up a bit too tight and scraping, but at least it didn't slip any more.  See if there are some adjustment screws/nuts that you can tighten it up with (I don't mean the locking screw).

Carole

[Fay]

yes I am going to do that today, Carole, & tighten everything!

[Tony G]

Mine used to slip in any position. 

Luckily that was posted after the watershed.

Tony G

[Carole]

Oh dear.  Pampas grass again.

Carole

[RobertM]

The scope warrants a decent focuser not the lightweight one they put on it !