I have never seen this fix before, so thought I would share. I got tired of the stock Fox 40 bumpers always spinning and moving. I created this simple fix and it works great. No movement at all. Just drill a small hole (lengthwise) in the bumper; small as possible. Then feed the zip tie (zap strap for Canadians) through the hole. Tighten up and good to go.

Fox 40 Bumper - Zap Strap Fix-fox-40-bumper-upgrade.jpg