They are just hollow plastic so I don't think they do anything for vibration. I used a small block of wood with a cloth over it when I removed my original plastic bar ends to keep from damaging them. I did notice that my replacement bar ends stuck out a tad bit further than the originals so I am wondering if who ever did the install put the originals back on? I hammered both in as far as they would go and I have not had any problems with the throttle sticking due to expansion yet. I have noticed that I still can not tell a difference between the high and low setting, they both get pretty hot.
2011 Cross Roads Sunset Red
OEM short windshield, passenger backrest, crash bars, saddle bag bars, heated grips, vinyl closeouts, tachometer, ambient temp, LED headlight, luggage rack. WD lay down licence plate.