Is the spool IN THE HOSE????? If so then I will bet that is the same hose used on the UDS-1 pressure gauge. The spool was built INTO the hose and it will not come out. ....I can help you with that. I just need the gauge to "remember " what the size was.
I can make you a 2 sized spool so it will work with modern hoses. USD also used the same hose end for the fill adapter for the UDS-1. Here is a photo of the spool I made for the fill adapter (and the SPG). I made several of them for Don and Sheriffdiver for their UDS-1's
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