Bigsby Identification.

Need help identifying which Bigsby you have? Basically there are only 2 classifications.

If your tension roller is held in place by a 1/8″ axle with a hex set screw underneath the Bigsby, then you have either a Bigsby B5, B7 or B12

If your tension roller is held in place by a 1/4″ axle with circlips on each end, then you have either a Bigsby B50, B70 or B700