Thanks, Flip
I used two 1-1/4x3/8 neoprene rubber fender washers from the speciality fasteners drawers at Home Depot. Worked perfectly on my '08 Classic and I didn't have to adjust the control switch set at all. I have a third washer in the tank bag along with a 4mm allen wrench just in case.
It puts just enough friction on it that the throttle holds and will spring back gradually if you hit a few bumps...or as already said, a light tug on the weight end lets it snap closed instantly.
This one is just too simple and saved me a nice chunk of money...I was planning to buy a commercial solution before my upcoming trip into the Beaver's Bend Oklahoma week after next...no need now!
Thanks, Flip!