I received another vote for reuse of the stock rings. Still a tough choice, but actually starting to lean toward reuse. I emailed the guy who made
this site about our situation, but still no reply. There might be some value in heating up the original rings while they are open a bit wider than they are in their "relaxed" position to give them a tad more spring force. That would solve all the questions here if it actually worked. I PMed Johnny Mullet a while ago now about this, but no dice there either. I really wish he'd respond.