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I installed one on my 06 WideGlide because of the possibility of the stock auto chain adjuster causing chain to get too tight. Been thinking about installing one on the 03 EG. The WG shifts better since installing Hyden but it's not the same transmission and they did make the clutch easier to pull on the 06.
Hayden customer service told me a few years back that the shoe will wear from the chain side plates groove into the shoe then the rollers will ride on the shoe and wear is minimized. Looks good to me. The original M6's had too long of springs, since then the springs have been shortened.