Oy
Hello,
Thirty years is plenty long enough for the stainless inserts and screws in these units to react with the aluminum sections, and form a fused mass. Possibly some chemical solvent would make the aluminum oxide go away, but also possibly the aluminum has been seriously compromised by the corrosion. The only option I can think of that doesn't involve new furlers is to remove the old rod, slide it out, slide new rod in with one end unfinished, and head that rod in place. The rod will be new, but of course it will be living inside antique furlers of unknown integrity.
I wish I had better suggestions, but from here it looks like the optimal thing would be new rod and new furlers.
Fair leads,
Brion Toss
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