Dave Molloy. Address in MPH. A minor complication is that one has to sign a "release" to keep Thornton free from liability. I imagine this is because the cost of insuring against someone spilling a cup of coffee while unpacking a Thornton and suing for zillions is too costly.
They're very, very good units. They completely transformed my bike,
I agree with Tom, but.........The location of the rear springs within the spring boxes leaves a bit to be desired. There is no provision for locating the springs on the axis of the pivot ends,hence the springs fall to the lower side and rely on the telescopic spring boxes to hold everything in line, which they dont and wear very quickly to a razor sharp edge. I have overcome this by making up replacement alloy packing discs, in place of those provided, having a register which locates in each end of the springs and hold everything in line.
Our Dutch members have,I believe , gone one further and fixed the springs to each end similar to Vincents original design.
This critisism apart,the ride is transformed and you are very aware that the front forks are moving far more than you became accustomed to with the original springing, and comfort and roadholding is improved accordingly.
The Thornton rear springs appear to be a problem, "
I would not say it is a problem, more of a minor hitch which could easily be rectified in the manufacturing. It is easy to overcome if you have access to a lathe, but I cannot see why you should have to. The improvement in ride is well worth the trouble and I feel more at ease with matched dampers front and rear, although I doubt I ever ride to the point where mismatch would be an issue.
We have another bike we are building at the moment, and have fitted it with Avo adjustable suspension units of a similar type to those fitted by Tim Welsh and Russ Kemp. I hope we can report back on their performance in due course. These are particularly interesting as a comprehensive range of spring rates are readily available.