Truck arm
Precice, ingenious piece of engineering, last one lasted me 4 and a half years and the board was second hand. I hit a driveway that had a 3inch lip at the road. The threaded pin broke at the base but didn't come out so it just felt a bit looser in the truck for a couple of days. I investigated, found the problem, ordered the part and fixed it within 3-4 days. Back to cruising the beachside.