Originally Posted by
Duragrouch
I saw that when I searched on that site for "lockjaw" kit. But none of those parts resemble the broken part posted in the OP.
That is it, OP used the term "lockjaw" which was the system on minivelo and cadenza that Ron showed in picture. The part the OP showed seem to be the adjusting threaded bar from the cam over locking mechanism on "regular" dahon frame (Mu, speed, helios, mariner etc.).