Sorry if this is a bit far from the forum's topic. I can't find a forum that's really appropriate, and I hope people who work with metal will know the answer.

My gardem has a gate of the sort that commonly appears in a chain link fence, and it was scraping the ground when it was opened. I've adjusted it, but I don't know how to prevent the problem from happening again (and again and again).

The gate's hinges are attached to the gate's frame on one side, and a supporting pole on the other, by metal straps. Each strap is clamped around the support by a nut and bolt. But no matter how much the nut is tightened, the straps are going to slip a little at a time until the gate is resting on the ground again. I can see by the marks on the supporting pole that this has happened before.

There should be a "right way" to install this gate so that once it's adjusted it stays in place. Does anyone know how?