I tried the hand/thumb throttle thing & couldn't get it to work well for me.
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I also tried it in front of the shifter.
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Mine was a kit but not the TeraFlex one. But more or less the same thing. I haven't decided yet if I'm going to try installing on again of not. I've got to see how sensitive the 6 pack is first. And how well I do trying to drive it with my right leg.
Yeah, the main thing is overcoming obstacles in the least eventful way. Whatever works for you.