They look damn cool, just installed and yes I had to make changes but if you can't handle changes don't install anything yourself. The left grips, as others have said, are very, very loose. It seems to be designed for an inch and an eighth tube instead of an inch. But grip glue should solve this problem, I used gorilla glue, will update later to tell you if it holds or not. Now for the mods, no two bikes are alike so it's silly to think the throttle body will be the same size. For example I have a Harley derailleur and they have a machined groove in the throttle body for cable routing which also allows the derailleur engravings to have a lower profile. I realized that once I tightened the switch cover and tried to flip the throttle the throttle body would not work, but it rubbed and would not return to its original position. Instead of going crazy with mods, I just removed the crank from the throttle body and installed it onto the stock Harley throttle body along with some Gorilla Glue. Fits just like the original pen so I'm sure a bit of glue made it pretty solid. BUT. To be honest the left grip was ridiculous, too big for a 1 inch handlebar hoping the glue would hold. Let's see
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