John- I'm no Jubilee export but I have taken apart ()and reassembled!) a lot of Huret derailleurs. The short cage one I have uses the ball bearing and adjustable pulley wheels (some might have more traditional bushed pulleys, especially the tension/lower one). On the side of each pulley are cone wrench flats. Inside each pulley is a row of .125" balls (IIRC). Each pulley side piece is one side of the ball race. By rotating the side pieces one can adjust the bearing play or tightness and take them apart. Do so and clean the balls and rolling surfaces (the races), but take care when taking things apart as the balls can fall out and run all over the place. When you reassemble and bolt into the cage the adjustment is set as you tighten the pulley/cage bolt. This is the added challenge when doing the cage/body pivot at the bottom of the parallelogram. One bolt does double duty being both the upper pulley bearing locking function as well as the cage pivot (and cage spring) service. With out taking mine apart right now I believe that there is a lock nut against the cage that the spring surrounds. This would be used to lock the pulley adjustment. Then the bolt's extension inserts into the body and is locked by it's own nut.
Really every thing is simple bearing mechanicals in different shapes. Find some exploded diagrams on line or take some close up photos to serve as guides to keep track of which way the next piece goes. Do all the work over a cloth covered bench, little parts don't bounce as far if they hit some thing soft... Place the parts out in a row, the same "side" up as you take things apart. Then clean each one at a time, keeping the order and rotational aspect. Count the # of balls in each pulley a couple of times and compare, they should be the same. Use grease's tackiness to help keep parts in position during assembly.
It's like working on an old car. You see all there is right there. You can rebuild it all with simple tools and adjust it your self, for better or worse. If you're still nervous go get an Alvet model and take it apart first. It's actually more complex what with the parallelogram's nuts and bolts. The Jubilee will seem easy after that. Good luck.
>I recently came into possession of a full Huret Jubilee set; both the front
>and long-cage rear derailleur look NOS (after some polishing), but it's
>clear that I need to do something with the jockey wheels as they feel very
>crunchy.
>
> I was wondering if anyone has a link to an exploded diagram of this
> derailleur? I don't want to disassemble without one, I've heard these
> derailleurs have a propensity to explode into a mass of springs and tiny
> screws if one isn't careful.
>
> Also wondering if anyone has made a side-to-side comparison with the
> short-cage. I assume the mechanism is the same, only the cages differ?
>
> John Ferguson
> NYC
>
>
>
> _______________________________________________
Andrew R Stewart
Rochester, NY