Hey ChuckAuger(engine guru), I haven't written to you in a while. Excellent photo essay! I have a MAG .91 that vibrates like crazy at idle. It shakes the whole plane.

In photo #2, with the crank on the High Point Balancer, it looks like you have only the rod and wrist pin?

If properly balanced, the crank with the attached rod and wrist pin, should rotate to any position w/o rolling back?

Why don't you use the whole assembly(piston to rod), and balance this against the crank counter balance?

I thought the shape of the counter balance, helped the flow of fuel, by throwing it up the ports, with those flat parts? Is it just a counterbalance?