I have a mid 80s Bianchi Sport with a 5 speed uniglide freehub. I went to go for a ride today and freehub starting sticking when I tried to coast. I took the wheel off the bike and ran some light oil into the freehub body. I got it to spin free except when the wheel is standing up with the valve stem near the bottom, then it will stop. I am assuming the freehub is toast. I see a couple Uniglide 5-speed freehubs on Ebay. Also according to Sheldon Brown I can replace it with a Hyperglide freehub. Rear dropout spacing is 125 mm. It has shimano "Z" components. I know its silly but I would kinda like to keep all that original. What are my options if I replace it with a Hyperglide freehub?