Rear derailer install on collegate

[62typhoon]

I neglected to take a picture before disassembly...do I have the nut on correctly on the backside of the derailer?.....what is its purpose as the bolt is threaded.
Just to lock the bolt in place?,,thanks

 

[Eric Amlie]

I'm more familiar with the earlier Huret Allvit/Sprint derailleurs, but I don't think that bolt is supposed to be locked up tight.
The body of the derailleur should be able to pivot back and forth to a certain degree(there are stops built in to limit the pivot).
That's how the earlier derailleurs work anyway.
It can be a fussy adjustment to get the lateral side play out while still allowing the back & forth pivot.

 

[Xlobsterman]

Try this.........

 

[62typhoon]

Sweet..thanks Xlobsterman for the exploded view,confirms my suspicion that it's just a locknut