I am in the process of restoring my 1940 Farmall H Serial FBH-21044 and have finally tracked down the original Small diameter, Slotted PTO assembly for this tractor. I also have the later style splined PTO assembly that I would like to use instead. Can anyone tell me if the existing counter shaft in this tractor is usable by simply removing the "adapter" #59372DX? While I am able and actually have a used counter shaft that I believe will work with the later style PTO, I am really not excited about tearing the entire transmission down to swap out counter shafts if I don't have to. On a related note, how is the slotted counter shaft adapter connected to the counter shaft? If you have pictures to offer, please send them my way. email@example.com. I also have photos of both PTO assemblies and the counter shaft that I can install if I need to.