Hello all,
Can you gents shed some light on my two harmonic balancers?

The one from my 235 has "indentions" in the cover hole and a 5/8" wide pulley, and the one from my 261 has a round center and a 3/4" wide pulley.

Any reason? Thx!
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Last edited by NeptuneGreen55; 04/14/2021 1:35 AM.