Many thanks to all who have contributed to this thread, which strayed well beyond my original request. I have now agreed the purchase of the shock absorber I wanted. I already had in mind to check the other points which have been raised, and look forward to enjoying the Vintage Revival again.

Location: Just north of Cambridge

On re reading your original post, the problem is axle tramp over 65 mph, I doubt the problem is entirely to do with damping. Have you checked wheel balance, play in steering joints and king pins? even slight play in the KP will cause tramp. Is toe and castor correct? What size wheels and tyres are you using, are the wheels true, and what pressure in the tyres?

Location: NZ

HI

I am using the following setup on my special:

https://www.facebook.com/LotusSportster7/photos/pcb.1179072518876922/1179069122210595/?type=3&theater

Here is a picture of the bits:

https://www.facebook.com/LotusSportster7/photos/pcb.1247224022061771/1247222972061876/?type=3&theater

I was advised from a very good source the single shock would do nothing of any value on the front of my special.

James