The mak is mounted on the "native" vixen side of the mount. The refractor is mounted using an accessory vixen dovetail attachment screwed/bolted to the other side. I am using the SkyWatcher provided vixen bar and tube rings. The attached photo shows the relevant bit of the set-up.
Would I be likely to get better stability if I mounted the refractor using a Losmandy type plate or perhaps tube rings spaced further apart...or closer together...or...?
I wonder if anyone has any recommendations before I start investing in new kit that might not make any significant difference.