I seen your post of the video of the spark plug. In the video your cranking it backwards. I know it could be designed to be that way, but typically they go the other direction. Please verify the proper rotation.
Jeff marx
Sounds like when I made my Briesch olds and Schaffer Lil' York. I remember having a sore thumb and wrist. I found that initially putting a liberal amount of oil through the spark plug hole and retrying, I got them to run a short burst (smokey to!) The Olds was not getting the homemade rings...