Baader produce a 4in1 Universal 2" Clamping Eyepiece Holder for Zeiss (M68), Astro-Physics (2.7"), Vixen (M60), and Celestron / Skywatcher (M56).
It screws directly into the Vixen 60mm draw tube and I think it has a couple of grub screws to lock any 2” accessories and eyepieces.
http://www.optcorp.com/product.aspx?pid=8886
Cheers
Dennis