Connecting Field Flattener to Telescope

[Zepp]

I have an AstroTech AT115 refractor with Field Flattener/Focal Reducer combo and love it.  It is threaded at the top so it can be screwed into the rotator.  I wanted to get a plain Field Flattener for galaxy season, however, there is not one with threads like the FF/FR combo that came with the scope so I have to use one that slides into focuser and uses the compression screw to hold it and the camera and such. 

I would like to add some extra security to ensure this connection does not fail and was wondering if anyone has ideas.  I was thinking of rubber straps as a precaution.

Thanks Kurt

[michael8554]

The online images suggest the focuser has 3 radially spaced screws, so that is a lot better than the usual single screw

But if you're worried, get a Flattener with threaded connections. 

Michael 

[Zepp]

Thanks, I never had any problems with my old telescope and flattener which was not threaded.  I was looking for a threaded flattener to connect up to this scope but it does no exist.