Chris, What’s the pro seal upgrade ? More inner orings ?
A new oem rearmost grease seal in a new oem housing is not tight like it should be, and front seals can pop out for a variety of reasons so we started 'sealing the seals.'
Pro build upgrade with front and rear seals glued to housing +29.
*Front and rear seals are glued into a locked and aligned position with special rubber bonding glue and flash cured to help keep seals in position and prevent seal pop or movement, and to seal out water and corrosion.