No one said ALL the parts interchange but a lot do. Things like idler gears, clutch cams, springs, worm gears and pawls possibly. Ive personally used Bass Pro parts to fix a Lew's so I know its true. Like I said I can take a picture of all 3 reel brands after taking them down to the guts and you would have a hard time telling which is which. Stuff lie spools and sideplates, etc will be reel specific though because all use different spool brakes, etc. Handles are another thing you can swap but you can swap all kinds of handles on all kinds of reels.