This video shows how to unravel tape from the center hub to remove raised inner tape that is jamming the tape pull flow and then how to rewind it back onto the hub. Video also shows how to open some other cartridge brands: "two post" variant of three post "CBS" type cartridge (also shows how to remove a label when possible. If it doesn't come off and starts to tear, forget it); "Scotch" brand "smooth, no holes on back" type (recommend frontal removal/replacement of foam in lieu of opening cartridge); United Artists/Liberty (3 posts on underside and label fastened) type, RCA no rivets glued type. Video also shows how to replace felt pads on metal spring mount tabs