Make It Yourself Using Bicycle Parts
I plan on putting the throttle on my gear shift lever, but the bicycle shifter was made for bicycle handle bars, and they have a bit larger diameter. I need a spacer. Looking around the garage I found some schedule 80 PVC left over from a sprinkler project. Perfect!
I cut a small section of pipe about an inch long. Then I split it into 2 pieces so I could sandwich it around the gear shift lever and clamp the biclycle shifter over it. A little black paint gives it a cleaner look.