Hello Dan I don't see any reason why it can't be done.
Caution!!! If this procedure is accomplished with the prop installed, it puts the operator of the timing light in close proximity to the turning prop which can kill.!!!!! As for a special tool, I assume that you are using a standard aviation ignition harness and I don't know of any tool to accomplish the task. You could probably make one using a small diameter tube to fit inside the plug on that end and have a large enough inside diameter to allow the plug lead spring to sit inside of it, thus giving you a place to clamp to the plug. Orma Southfield, MI N110LR Tweety, old enough to drink this year Flying and more flying, to the gathering or bust http://www.kr-2.aviation-mechanics.com/
