Balance quality is the deal; Counterweight momentum (weight) needs to be matched to the slug&rod momentum (weight, to minimize counterweight "wafting" which exercises the rodpin armpit for pit cracks.
PMD Crank strength is quite good when flexure is constrained to NA pulsed torsional TQ.
BTW Some strong AL (steel too) rods are now lighter than the BME AL rods i had, by 50 grams.
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