Steve,
You gave away at least One. I used it to find TDC on my 13B that Sunday afternoon when I got home from Paducah, worked great, and confirmed that the timing mark on the case was in line with the mark on the E shaft.
Bob Perkinson
RV-9 13B
From: Steven W. Boese <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, February 24, 2011 10:28:05 AM
Subject: [FlyRotary] TDC
Chris,
The attached photo shows a device that makes it easy to determine the location of the minimum combustion chamber volume (TDC) within a degree independently of any existing front pulley or flywheel markings. Connect it to a spark plug location and just rotate the eccentric shaft to the point where the soap bubble in the clear tube is the highest. It might be worth a try. I made up a number of these to give away at the Paducha fly in last summer. The lack of interest was surprising since I couldn’t even give them away.
Steve