There is a critical step required to lock the fenders in place that sometimes gets overlooked. If you still have the yellow instruction booklets that ship with SENTRY, definitely check out the diagrams there for a clear picture of what we’re talking about.
Pulling the loose ends of the straps to the desired height is not enough to lock it in place! The key step is to push down on the top of the foam body of the fender to get the straps to lock into the jam cleats fully. The harder you push down on the fender, the more the blue cleats will lock onto the strap. Pull up on the top of the fender to unlock the strap when you’re ready to leave or need to reposition.
SENTRY Fender Installment Video: