Razor E300 Thumb Throttle
thingiverse
Just a simple model to slip over the throttle on a Razor E300 to convert it into a thumb throttle. I've been using it with my E300 for a couple weeks and it works very well. You will probably want to move the throttle further up on the handlebar and replace the grip with a longer one or wrap the space between the grip and the throttle with tape May work with other Razor e-scooters, I'm not sure. The E300 is the only one I have.
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