Original 39-4300 Shaft was all of one piece, with the metal flange at the end being welded to it.
The newer style 39N-4300/39N-4200, that flange at the end is a replaceable plastic piece. If you just need the flange for the newer type of shaft, you order that here. NOTE: Does not work on the older style 39 shaft that had metal flanges welded to the tip!
Depending on which reel model you are ordering parts for, you will need to order the 39N-4200 or 39N-4300. These two parts have the 39A-4300 already attached.