I would probably buy roller bearing replacements if I had to change head bearings, but the thing that destroys the original ball type is lack of lubrication and the resulting corrosion. I put a grease fitting in the head tube of my 1972 H2 back in the late '70s and have kept it greased since then. The bike as something over 40,000 miles on it, and the bearings still feel like new... no notchiness, easy to adjust, etc..
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