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@bdm
I made one bolting together some old scraps of angle iron and then arranging bits of wooden stick (like rulers) to act as the feelers. Very Heath-Robinson - but functional. I've built and trued several wheels on it. Also a home-made dishing tool from bits of that "cardboard" angle stuff used by builders to protect corners of plasterwork, and a 10cm piece of an old measuring tape in the middle to tell me how far to the drop-out.
...so I'm sure any commercial product will do the job!