I spent some time fixing my Manta senior reel from 1995 . Dummy me took it apart and was missing the inner locking bar . It took two tries to make this new piece but finally got it right . The dive industry is not to smart and does not like to innovate . Why the industry does not use the Ruslyn reel is beyond belief and the only reason I'am posting this , it being so good , could save your life . Reeling in Explosive Ordnance Disposal ( EOD) and clearance diving the pack reel has a 4 inch hub and 2.4 inches wide , one bad mother of a reel !! Notice I did modify mine which made it the best dive reel on planet earth . Rumdumb and that's a fact