I had a '57 VB back in the late 60s/early 70s. I used to run it a full advance on the open road but retarded it a bit when hill-climbing. It would 'pink' to let me know it wasn't happy with the amount of advance.
At speed (relative for a VB) I would have to hold it at full advance while the mudguards split, the bar-end mirror came loose, the silencer fell in half and the fuel tank split around the central mounting bolt. These things can certainly vibrate
Back then, of course, it was just a bike and my go-to-work hack so it got ridden hard - I recall heading into Wales with 73mph on the clock, me flat on the tank and thumb jammed between the bar and advance lever. I'd be about 20 back then
Two years ago I started getting into MO1 Mags and bought a load of parts. I converted four to take the 'Brightspark' condensers. One is on the VH the rest are spares. I don't have another 'Slack Wire for Advance' Mag but notice that one of my spares has the pickup on the opposite side to what I'd consider normal. Interesting degree of variation in these units.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH