I found another value to prop balancing yesterday, when I was asked to do my neighbor's Cardinal. The balance was fine where it was - but we discovered that his tach was reading 150 rpm low! Old mechanical tach, certified balancer that of course knows the prop rpm perfectly. So we didn't touch his prop, but did build him a correction card for his tach.
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)