Thanks for the PM,
for anyone else that's interested:
1. Which model Vista Cruise did you use?
a. Not sure which model, sorry.
2. Does it clamp over your Grip Puppies or to the grip underneath?
a. No it doesn't grip over the puppies, my Vista clamps the grip underneath.
3. Is there any binding of the grip when the Vista is released and can you still turn the grip when the Vista is engaged?
a. No binding, my throttle turns freely and you can turn the throttle when it's applied, it's just very stiff.
So, that means that it also doesn't "lock" the throttle completely it just keeps it in place and very slowly backs off. It gives your hand a rest and that was my main objective.
NOTE - you might have read where others complain about the throttle spring tension and they remedy this by removing one of the two throttle return springs. Mine has both springs in place so I would suspect that my Vista would "lock" if one of these springs were removed. Frankly the throttle tension is not an issue with me.