When i put the drive on i put the aluminum ring on the rubber inside the bell housing what stops the water from getting inside the bellows from behind the aluminum ring once you install the drive and tighten it up ? is their a rubber 0 ring that goes on the drive that will mate up to the aluminum ring when its together ?

yes, it actually is installed into the helmet first, then you put the drive on

jim,,the outside of the ujoint bellow and at the end of that aluminum ring is what the drive is what seals the gimbal from taking on water..

ok so the drive it self has a seprate o ring the size of the alminum sleve that goes on the drive housing back at the flat spot wher it mates up to the bellhousing ?

jim,,the seal is part of the ujoint bellow,,no need for a oring..i ll call u ..