Hi
dansblackcat,
Thanks for that info Dan,
As you would know from this thread, this device is an after-market development and was never fitted by Scott Bonnar nor by Rover Mowers.
I suspect it was a Western Australian invention to sort a problem with out-of -balance cutter clutches.
However, if your original cutter clutch is in balance, fitting one of these would throw it out-of -balance. Not a good thing, especially on a twin rail Scotty.