I have been using it, there is some error in my book. It is what ever method you are comfortable with. Part of me says it is more accurate but the jury is still out.
3 people will get 3 different numbers sometimes.
Did alittle carb work.
Glad you asked. I've been off by 3 degrees or close as 1/2 a degree. And this is why I put this out, I try to be consistence as possible, like same method to read openings. Grant it I'm looking thru a plug hole and have to use the same light and hold my head the same. Transfers are tough sometimes.
I've degreed a saw and had my brother do it and we get different readings. I've done it with @wigglesworth and we are different. I always second guess myself and keep rechecking.
The throttle shaft went on the same diet, I also did the Treemonkey fix.
Randy you are so correct in using the ring.