I took off the bar end cap and I see a solid insert. It does have 2 flat sides like it could be removed. I haven't tried to remove it yet just wanna make sure it can be removed before I go wrenching on it. I bought bar end mirrors where that the adapter is put into the bar.
I’m not 100% certain what the Street Triple bars have but here are picks of the ends of Tiger and Street Scrambler bars. The inserts are held in place by a pin that can be pressed or punched out. I’d check before you go “wrenching”.
The bar end mirrors I put on my Scrambler came with a spacer to go around the outside of the handle bar, leaving the insert in place to mount an end ”cap” ie disc.
Slip the throttle tube off and have a look at what’s there. I see the diagram is for a model with throttle cables, rather than the newer ride by wire. Is that what you have? Knowing which bike you have would make it easier to answer your question.
Well I took some time to look a little closer at the problem and found that I could slide the insert off the end cap and the bolt fit the threaded end of the bar and just bolted them right up and fit the mirrors on.
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