Yes 've seen "worn out Saitos, mostly 50's and 65's in competition use. They are so good a bearing and ring change (as applicable) is all that is usually required to bring them back. Though I once got a bore flash hard chromed as an experiment, good idea but not really necessary.
Now mySaito activities are at a halt, the 40 degree C temperatures with 70+ humidity are playing havoc with performance figures. So aircond and internet trolling is the activity of choice at this time