I found a good ab33 mag and mounted it up. Could someone post a photo of the spark retard mechanism. Looked on line but cannot find. Ordered book from hit miss enterprise but have been waiting for weeks for that to arrive. I can start engine by flipping the fly wheels without crank, but the timing is to far retarded. I read there was a roller that flips out of the way when engine starts to advance the timing once fired. Any input appreciated.