My automotive spark plug sockets are too big, so what size socket should I buy for my #5247's Champion CJ14 and my #10550's NGK BPMR4A?
3/4" handles the cj14
Do you think the 3/4" would also work on the NGK BPMR4A?
Looks like I quit typing! Yes, I believe it will.... It is a very odd plug to take someting other than a 5/8, 3/4 or 13/16" plug socket. I have an 11/16 plug socket- just in case :)