The dampers were made based on the article by Roger Harris in Cheval August 2011. There is a copy in the members area.http://www.arielownersmcc.co.uk/members ... lector.php
The damper uses the Ariel steering damper star washer and friction discs so the size of the damper is made to suit the friction discs (2 ½” dia). The 2 arms are a different length (4” and 5” c-c) and the width of the arms is 1”.
I used polyurethane trailer leaf spring bushes for the ends and cut the length to suit. The offset on the bushes is adjusted top and bottom of the damper arms to suit the alignment between the mounting points. I made my wheel spindles and they are a little longer than original so I made my offsets to suit. There is a sleeve within the bush that is a little longer than the bush to provide end clearance and allow the bush to pivot. The outer size of the sleeve is to suit the urethane bush and the inner to suit the fixing bolt. The top pivot is an extended mudguard mounting stud 3/8” at the bush however I only used a 5/16” high tensile bolt threaded into the axle.
I use a nylock nut to hold the tension on the damper, and it does not need much tension. The damper does of course work in both compression and rebound.
I will be out of internet contact for about a week but if you need anything further please PM me and I will reply when I get back.
the photo below shows how the end bushings are offset to one side and the other to give a good alignment.