My sparkplug is angled at 45 deg. I guess the intention is to get the end of the glow plug as close as possible to the corresponding spark-gap location. The plug being angled will make it a little more difficult to measure exactly how high above the piston TDC the center/end of the spark plug is. If you just used the dimesions of the sparkplug from the end to the top surface of the head that the sparkplug seals against, you could just make it so that the end of the glow plug at full insertion coincides with the location where the end of the sparkplug would normally rest. On another note, has anyone maybe considered the possibility that using E15 fuel would give you a 15% ethanol blend in the fuel already? What is the possibility that some people that are having success with this system are increasing their chances of success without knowing it simply by using a gasoline/ethanol blend anyway? Can anyone out there maybe shed some light on this? How about you AV8TOR? On still another note, I'm not sure if eliminating the flywheel on a magneto engine would not affect the engine balance. Doesn't the flywheel also contribute some degree of counterbalance for the engine or is the flywheel in itself balanced so as not to have any net affect on the engine? If I let you know what kind of sparkplug my engine requires, would that give you the information you need to make an adapter for me?