Some of the RGV forum swear by them, but I had an RGV250L crank done by them and it was crap! A mate had similar issues with a GT550 years ago.

Luckily I bought 2 new NSR cranks a couple of years ago, so I'm good for some time yet. The RS rarely gets a chance to stretch its legs now, because I simply can't fit onto it!
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89 MC18 R5K
92 MC21 SE
91 RS250 NF5