I replaced some Chinese full sized tuners with the 640s. They were so much lighter they didn't seem real. The size turned out to be a virtue, though, because they covered up the holes left by the screws for the original tuners.
I wrote to Allparts to see if their tuners were reversible since I needed them for a 2+2 headstock, and I couldn't find more than one treble-side a la carte. They said their tuners were not reversible. Too bad!
Incidentally the Hipshot imports also have a hex screw, and Hipshot takes great pains to say they are not reversible. They look so similar that I have been tempted to try it anyway. I have not tried it mainly because, in the words of the prophet, "if it ain't broke..."
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