[Carl]

Where the focuser screws on to the scope or extension rings the flang (for want of a better word) on the inside edge of the focuser has a 45 degree bevel.

When you screw the focuser in i dont believe that it is sitting perfectly flush with the adjoining ring end. It moves around on the 45degree bevel.

I would imagine that in order to have a perpendicular plane to the mirror you would need the focuser flush.

I am considering lathing the focuser to ensure a flush fit.
has anyone else noticed this and does it cause tilt issues in the image?

Assistance please

Regards
Carl Rainer