First off, thanks for the kind words, guys!
And regarding the extra hydraulic spool, I've only seen one other Massey that had this option and I wondered the same exact thing. The answer is, they're for NOTHING. I couldn't believe it. There are just two plugs in each port of the third hydraulic spool. I guess it was there for the owner to decide what he wanted to do with it and plumb whatever to it.
I thought about adding a hydraulic top link to my Massey 1855 and using the auxiliary hydraulic spool to control it. I've spent hours and hours searching and researching and I don't really know if I want to do it, because of price and the fact that the shortest hydraulic cylinder that will work, is a couple inches longer than the relatively short Massey Ferguson original top link that came on the 1855.
I thought about using this..........
But then people say you need check valves otherwise there will be cylinder fade, and that adds even more to the cost and then you've over $200. I still don't know what direction I'd go.
Old post, but what about using the deck lift cylinder off one of your parts tractors? The over all length is just a little short but nothing a modded clevis wouldn't fix? That's what I'm thinking of doing with my third valve.
PS, Did you end up using the dash off of that one you acquired?