Adapter Chain:
Hutech 7912 (M72 to M57/60), Tak 17 mm long 72mm spacer, Tak
TPQ1061, Tak Male to Male (don't know part but fits large side of
TPQ1061), FLI "Takahashi FSQ Adapter" (which doubles as a camera
rotator) then FLI parts and PDF through to STL camera

The disadvantage of this is the cost of the PDF (about the cost of the
OTA) but I use PDF on multiple other OTAs and this allows me to
completely clamp the top knob on the Vixen focuser so I get no motion of
the draw tube in its sleeve.
VC200L with STL11000 Camera
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The VC200L is light. And it is designed for use with a large format (heavy) camera. I have the OTA as far forward in the
rings as possible and the dovetail as far forward in the saddle but it was very camera heavy.

So I used an old saddle, attached to the front of the dovetail, then put a bolt through the saddle and mounted two Nordic
Track weights on the bolts (using nylon washers to fit the weights to the bolt).

With 12 pounds added to the front it now balances in Dec.