I recently purchased some foam grips for the 18. You know, the ones that have the chrome cap at the end (the end cap is held on by a screw on the inside). I have a big hand and the stock grips are a pain in the back :a13: errrr hand. So, after removing the OEM grips, I removed the chrome end caps on the new grips and started to drill out the centers. After getting to 3/8in I got my dremel tool out with a sanding drum and sanded the hole out. I sanded a beveled edge into the hole I had drilled from the inside until I could insert the drum sander attachment into the hole. I then continued to sand until I was able to fit the handlebar's end weight into the hole that I tried to keep centered in the end cap. After fitting the grip onto the handlebar I cut the rubber piece of the grip to length being sure not to cut the foam, handlebar or throttle sleeve. I installed the new grips chrome end cap, tucked the little bit of extra foam from the grip into the end cap and then I installed the weights. Then I secured the weights with the screws. I now can say they feel wonderful and it looks pretty cool too, if I do say so myself. If your interested in some picture I'll share them. Let me know.