I saw this ad in a magazine today. I bought that same 1968 BSA Lightning new in 1968. I guess I should have driven it down to Savannah and got me one of those hot southerns chicks. Damn! ...
This was done to stop any kind of speed wobble. The problem was you had to remember to loosen it when you returned to slower driving or you couldn't turn the handle bars. In town speeds weren't all leaning you did turn the bars a bit. If it was locked, oh...