Kraig and Scott -
1st, Kraig- Oh Great One "Keeper of the Photos" - you are absolutely the GREATEST!!! Your last photos are exactly what I was suggesting. Did you go out and do that to a blade and snap the photos or did you find them in your Great Archival Album? Have you got a couple frames just lying around so you can take photos like that? You are absolutely the Greatest.
Ok Scott - well here's a little more info. To remove the sub-frame from the A-frame of the blade you have to pry or "spring" the sub-frame off the large rod welded onto the back of the A-frame. Actually you don't necessarily have to do this if you can put together the set up like Kraig shows in the next to last photo (where the sub-frame is still mounted to the blade and the additional 1/2" rod is inserted across the top ears of the sub-frame). It will take you a little work to slide the sub-frame under your tractor and connect the rear arms of the sub-frame to the rod going across the tractor frame AND at the same time slide the rod into the quick attach latch. I wish I could remember for certain if this method works. It may have a conflict with your front axle (the ears may be to short), I just don't remember for certain. I seem to recall it does work or I wouldn't have even mentioned this. If you do try to install using this method you may have to slide the sub-frame under the tractor, and just set the rod (I suggest adding) onto the edge of the quick attach slot without fully putting into the slot, and then go to the long arms and lift them up into the area where the mounting rod crosses the frame, and then slide both into place at the same time. This can depend on the U slot you have in the long arms. Some have an equal shaped U, and some have a short side on the lower part of the U. Hope you have the un-equal U (longer upper side) so your frame will sit on the frame cross rod while you get the quick attach rod fully into place. Please note that assuming my suggestion of using the 1/2" rod works, then this hole exercise is fairly easily done once you've done it a few times. It's just doing it the first time that takes some figuring out how to exactly get things into place all at the same time. Another thought/suggestion is to have a little block of wood (maybe a 6" 2x4, to stick under the back part of the A-frame while you attempt this. It will help hold the front of the sub-frame up while you try to work it into position. I don't think you can set it at the exact height of the quick attach since your cast iron grill housing extends a little below the frame of the tractor itself and tends to get into the way when trying to get the rod into position of the quick attach latch. Ok, this is enough of my 10,000 words. Kraig's photos really tell the story. Good luck and let us know how you make out. If you can take some pics and post them it would be nice to see it all installed. A link to a You-Tube video of your installation would be really nice, but you'd have to cut out the first 15 minutes of the attempt, parts where the sub-frame slips and bangs against your concrete floor, or when you happen to put your fingers between 2 pieces of metal both moving in the direction of your fingers, unless you just cut the sound out on these parts. I do wish you good luck and hope it does work.
Wayne - come on now. Hydro Howard? These titles come only with well earned experience. Hydro Howard does have a nice ring to it, but he's not eligble for the title until he's restored at least 10 cubs of varying models, both narrow and wide frame. Rules are rules. Back in the early days BGC, titles were thru annointment by the Reverend. Actually my first was Elder Harry, but I petitioned for a change to Hydro Harry and received it with great blessings (and some appropriate penance).
Mike F - I sure wish I was closer to you. Sound like you know the machinist stuff inside out, or should that be outside in? Any chance you'd be moving to the west coast or even the Great NorthWest? You've been to many other parts of the country and it's great out here but just not many Cubs.