When I had my Pan I just used a very thick O-ring that rolled over the bar weight, and to use it you rolled it over into the gap between throttle tube and bar weight,simple,cheap and easy,even with gloves on.When you wanted to go back to normal, just roll it back.It came out of a Caterpillar engine gasket set when I was doing a rebuild, hence it was bright yellow.I kept a spare in my bike jacket pocket for years and never had to use it.