Hi, NH 350 cc 1954.
Arrived home the other day after a ride out and discovered that one of the swinging arm spindle nuts, the large chromed and domed nuts, was missing which left the swinging arm assembly loose on its bearings, the bearings are of the phosphor bronze type and not the rubber. I can only assume that the nut had loosened through vibration and had fallen off, luckily the centre spindle had stayed in place due I believe to the pulling power through the rear chain.
The thought of what could have happened is rather frightening.
Has any one experienced this situation before and if so have they devised a method of positively locking the nuts to avoid them vibrating loose ie a mechanical method of locking rather than something like Loctite, I intent to ensure that it will not happen again.