A few years ago I used 12 of these and damaged one mounting it on a bike rack. I just found time to replace the damaged cap. Installation was a bit tricky the first time as it required a tight fit. This time I smeared some petroleum jelly around the edges of the cap and tube before hitting them hard with a rubber mallet. Goes well with the hat! Hit him a few more times to fully collect him. I received a pack of 8 in case I have trouble installing again. quality product. Completes my bike rack in style!