Re: what to do with the end cap
It's typically called a bar end or a bar end weight. You can get replacement ones on ebay for as little as $10 for a matching pair. Just make sure it's for a 7/8" bar. They don't affect the throttle unless they are screwed in too tight, in which case they interfere with the throttle. In general, they are meant to provide a heavy weight at the end of the handlebar to reduce vibration.
Mine fell off also, and I got a very heavy one on ebay, but it still vibrates and makes my hands tingle, so I'd suggest just getting one that looks nice and isn't very expensive. I think you could just get a matching nut at a hardware store and then put the original one back on.
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