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Durabond PDP-17 is the best thing going
The std PD-17 is way better than Clevites and others but the PDP-17 is what most builders use--way less trouble than other brands on fitting--they look like they were made by someone that cares --hold up good to rollers etc the ONLY kind I use--have cut down on time wasting tight cams

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I had trouble with SP bearings on last build, cam too tight. Tried scraping/shaving and got better but still didn't feel right. Someone recommended Durabond bearings so I removed the other ones and installed Durabond PDP-17s using same tool/method and problem solved with NO scraping whatsoever. Comp solid roller fit perfect.