I can't find any info on how to disassemble a Winchester Model 64 carbine with a 3/4 magazine. The front of the magazine is held in place by a hoop which is dovetailed into the barrel. A pin runs through the base of "hoop". I removed this pin but to no effect. The magazine tube won't move. The magazine cap is slotted which gives the impression the whole mag can be turned. Haven't tried that yet without knowing which direction (counter-clockwise to unscrew as one might expect or clockwise to turn out of a slot. Really don't know what I'm dealing with and can't find a blow-up that shows the parts. Anyone out there have any experience with one of these?