Whow - I had a look at Rog's bump stops and then found his planetary box here:
Malvern Arms forumQuite a piece of work. But I also learned: on the four seater with the Rutherford side bracket those bump stops won't work.
And I double checked on the AVO website.
AVOUK - their shocks have a 1" bump stop built-in.
Now off to the garage: I hope to have a rolling chassis by tonight
