I didn't realize that argo sold the tsubaki chain. Is 630 chain the same dimensions as the RC60-1 argo chain? I found that stuff here in O-ring: https://fortnine.ca/en/did-630-v-pro...l-o-ring-chain. I'm sure if I found it here there are ten places that have it in the US. O-ring RC50-2 doesn't seem to exist. Anyone ever tried to use 2 530 chains instead of one RC50-2? For a cool ~$2000 Canadian bucks you could have all o-ring chains if that's possible.