Re: Original bar ends :)
Mate, trust me. I've had this issue. If they are universal they are designed to expand at any point in the tube (far as I know the GSXR tube isn't an odd size but I could be wrong). With my current pair, I was conscious of the same thing. Even worse, I have heated grips. My original bar end fell out because I loosened it to clear the grips, and it simply worked its way out on a trackday.
What I did with the universal was tighten to an inch or so out so that there's resistance to pushing it any further by hand. Now this will look odd. But then I used a mallet (not hammer. Any appropriately weighted item will do) and tapped it in slowly before tightening the rest of the way when it was exactly where i wanted it. Its now approx 1/2cm from the grip but I can live with that.
More importantly, it wont come loose and doesn't interfere with the throttle. This is my suggestion but good luck with whatever option you choose.
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