The bolt was previously set in crooked. 
I re-tapped it so the new bolt is straight. 
3/4″ piece of cold rolled for the mic mount. 
I noched it out to fit the curve of the mic. 
It contoured well, with a nice fit. 
I welded the mic mount to the rear of the fender. 
It came out nice. 
The contoured mount also locks it in place.
The BSA came with a microphone as a tail light. It was mounted on the side of the bike near the rear axle. It is a ’50’s area mic from what I can tell, I do know it looks sweet! I mounted it so that the actual mount is shaped like the base of the mic, which locks it into place. Since it is on a ridged frame there is going to be plenty of bumps tying to shake it loose. I think it looks cool as is but once it’s lit it will really shine! 😉