nyresq
Contributor
If your reg has a DIN fitting, then when the din is very tight, it won't swivel... it should only be finger tight. with the captured O-ring it doesn't have to be tight to seal right.
The part of the din fitting face that holds the O-ring is solid mounted into the reg body. the din face is not mounted on a swivel. The face and the shank that the threaded part spins around is a threaded tube and screws into the body. If your reg was spining before it may be because the o-ring was worn out. With a new soft oring it will move a little but it won't exactly spin freely. If you have one of the older poseidons that have a true yoke fitting (not a din-yoke converter, which is rare) then yes the yoke should spin with very little resistance. if it doesn't it may be because the yoke nut was cranked down too tight, or the oring is missing and the nut bottomed out on the yoke.
The part of the din fitting face that holds the O-ring is solid mounted into the reg body. the din face is not mounted on a swivel. The face and the shank that the threaded part spins around is a threaded tube and screws into the body. If your reg was spining before it may be because the o-ring was worn out. With a new soft oring it will move a little but it won't exactly spin freely. If you have one of the older poseidons that have a true yoke fitting (not a din-yoke converter, which is rare) then yes the yoke should spin with very little resistance. if it doesn't it may be because the yoke nut was cranked down too tight, or the oring is missing and the nut bottomed out on the yoke.