John, I seem to recall that somewhere along with this drawing on the BSA site that a question had been asked regarding the diameter of the aforementioned hole and the answer by the gentleman who drew the damper up was 1/8". However a friend of mine fitted a pair to his rigid VH500 and was advis...

Simon, just put everything back together today, Eddie Dow damper units, dual rate springs from SRM and 225ml of ATF. I don't think I will be riding it until Easter time as I have a few more jobs to do. I use my very rough 1957 350NH when there is salt on the roads. If I can remember I will let you k...

Thanks for the replies. Just looks like I will have to experiment with oil levels etc. The overall length of the units I have made is 19 1/4" measured from the underside of the fork top stanchion bolt to the end of the damper unit which places the extremity of the damper unit approx 6mm above t...

No problem adding oil; the problem I have is ascertaining the distance from the top yolk face to the bottom face of the damping device and thereby establishing the length to make the rods. I am aware that if they are too long there is a risk of the bullet shape rod in the bottom of the slider hittin...

Just made a pair of the non return devices as per drawing found on a BSA site, exactly the same drawing as I found on the Ariel site. The top mounting on the stanchion nuts is sorted and I can add oil through the chrome 1/2" plugs on the outside of the nacelle. Question is how long do i make th...