Looks like you like to build your own guns too. 80% was a blast while it lasted. :cool:

As I was just discussing with Dan, these swivels should be considered no longer available. The only shop I know of that will rebuild (RobAir Repair in WA) wants 500 each to rebuild, with another 1000 for the core if yours isn't serviceable. There was one place with NOS that they were just sending the last of to a customer, at 4k a piece. {If it ever comes to that be on the lookout for pics of my cool new fixed-gear 337 with tundra tires.)

The o-rings below are still readily available, but no idea about the circlips. Also not sure how you remove and reinstall those clips. Dan had some advice but I didn't quite follow. In any case he's done it and , it seemed, without any special tooling, so...

Two brake swivels on ebay from a g model
 

Two swivels rebuilt on ebay for 1402.50 each.....
https://www.ebay.com/itm/234648780242

Yeah, I saw those earlier. To clarify on my earlier comment, they should no longer be considered available new or new old stock. You'll either have to send your own out to Rob Air for $500 ea. and hope your cores are good, or find a deal like this.