Graph Tech Archtop Bridge PS-7551-N

While the plastic parts seem to be fine, the threaded posts and thumbwheels were a very poor fit. One of the thumbwheels had almost no knurling on the edge - rather like a very old coin. It was so loose on the post that it would not have taken the load from the strings for very long. The other thumbwheel had proper knurling but the fit wasn't much better - it too was loose.

I was able to use the threaded posts and thumbwheels from the bridge that I was replacing - remarkably, they were in far better condition after 30 years use than the new Graph Tech ones.

Perhaps I was unlucky or perhaps there is a quality problem with the item.