Very, very interesting. Thanks for the explanation. Maybe the frequency could be altered by changing some properties of the crank, if it turned out to be a problem and occur during rpms required to be extended use periods. I’m thinking cutting down the cw radius and filling with some heavy metal, to change the frequency range. Only worth it on very expensive cranks though, i presume.
Interesting, I got a crank with my engines pieces that had something done to it like that, the counter weights had a strap welded on and each sounded dead inside when tapped on.
