Porter.
That's what I thought with mine, that a force was being applied to both bars that was causing the vibration.
By putting the rubber dampers in the middle it went away.
From what you say that would seem to be the case. Which is why I said not to overtighten the centre front bolt and use the locknut.
Upt.

that they could easily

My 88 year old parents skipped church yesterday. This was in their way.
Any excuse.

I fully agree with the above. The licencing laws were brought about to reduce deaths in younger riders, which it has because there hardly are any of them! You can get a cheap 1.0 car for less than a second hand 125cc bike, take one test and then you're done. Unless the law changes (unlikely) the decline in biking will cnntinue. As we get older and less able the latest batch of 400/500cc bikes might keep us on the road for an extra few years, but the death of the UK bike industry is nigh unless there are some radical changes.

One bright spot is that there are more ladies taking to biking now than ever before. That's a big change and very welcome, but they seem to be in a similar demographic to most males (over 40). It's a start and some of the new 400/500cc bikes have very low seat heights to accomodate their needs, another plus point.