[Merlin66 (Ken)]

On the early Coronado PST (pre 11xxxx serials) the external tuning ring - the one with the knurled rubber cover, can feel "loose" and "sloppy".

This is caused by the two O rings Coronado used to support this ring from the housing - they go flat over time.

I have managed to source some of these O rings (47.35mm inside x 1.78 thick) and will make them available to PST owners....drop me a PM or email.

(Replacing the O rings involves:
- carefully removing the rubber knurled ring
- removing the M1.5 Philip head screw (and marking the hole it was in, in the lower etalon ring. Mandatory!)
-sliding the outer tuning ring from the housing

This exposes the housing surface which has the two retaining grooves for the O rings.
Remove and replace the O rings and reverse the above instructions.
Any questions just ask)