Hi all. Recently picked up a pair of Huret "Ratchet" shifters (that's what they're called here, maybe 2/3rds down the page), the kind with a two-way clutch and, oddly, no ratchet. No clue how a "two-way clutch" works. Anyway, tension is preset, and the unit comes as a piece -- you don't screw the shifters onto the bosses. It looks like this:





You can see the loop at the end of the spring where the shifter cable goes through. Apparently this is important to the design.



They come with a cap preventing access to the screw. There is no tension adjustment available (or required, apparently)



Cap on rear shifter has fallen off.

With all that, one of the shifters has more resistance than the other (it's nonuniform, too). Not too bad, so I could live with it, but maybe a good cleaning would improve matters. Can I just soak the whole thing in degreaser? Any particular things to watch for when taking it apart (it seems to be designed to discourage taking it apart.) Are there known issues with these and known fixes/preventative measures? Thanks in advance for any information!