Hi, I took the the weight holders out of the ends of the stock bars by grinding slots in the bar along the ends and pulled them out with a slide hammer. Then to install them in the new bars I drilled with a 7/8 in drill bit in the ends or the new flanders bars about 1 inch deep and drove the holders into the end of the bars. I didn't weld them they just fit tight enough to hold the weight end in. I did that last year and no problem so far . I use them when I have the cruse control on so my hand doesn't stop the cruse from adjusting the speed. You can buy after market end caps but they just arn't the same as original. I also have a drivers back rest and I have no more back ache on long rides like berore the mods.