Whats the Best way to do Bumpers?

[sithmonkey13]

we used aluminum c-channel that fit over the KOP frame c-channel. There were two small (about an inch to inch and a half) pieces on each bumper. We attached the bumpers with cotter pins, so if you pulled directly up, they would come out, but only if you pull directly up. We had 8 pieces, the 4 red, 4 blue, yet it only took about 3 minutes for one person to change all the bumpers (handy when we came directly from one match to the queue, one team member met before the queue, and we pulled off the old bumpers, and put the new bumpers on in the queue.)