... Arm tube dia... I'm happy to send steve my spare arm for him to use to get it right jerry
I'd quite like a custom counter balance too but purly for aesthetics... Is they any other benefit to them other than added weight (which it apears I don't need and have a jelco heavy one if I did)

Jerry ... Without wanting to lumber steve with loads of milling, have you thought about asking him to make you a big heavy weight/clamp?