TAL 2M mount issue

[alythall]

Hi,

Just bought a lovely Tal2M, but it appears to have a part missing on the mount. Does anyone know what belongs in this threaded hole? The axis moves freely otherwise and is unusable ☹️ I've tried a standard 5mm bolt and it does nothing.

Thanks!

Andrew

[CCD-Freak]

Mine has nothing there in the way of a knob.  I will have to take a closer look to see what it is for.  I think it may be to give access to a screw and I think there is a cover screw in the opening if I remember correctly.    I have never had to mess with it so I don't think there is much to worry about.   If the axis moves freely you may need to adjust the clutch in the RA drive housing.

Edited February 2, 2022 by CCD-Freak

[markse68]

hi Andrew, the Dec axis housing screws onto the end of the RA shaft and i think there’s meant to be a little grub screw accessed through that hole to lock it but truthfully you need to really tighten the housing into the shaft to prevent it coming loose. Have a look at this thread where i serviced my crunchy mount and i ended up shimming the shafts/bearings so i could tighten that joint without damaging the bearing races.

There’s a link in there to another thread with some pdfs of a tear down by Andyh too which might be clearer

Mark

Edited February 2, 2022 by markse68

[alythall]

Brilliant, thanks very much!!  Tightened up the three screws in the housing, fixed it a treat 👍🙂

Edited February 3, 2022 by alythall