general screw query

ddraver

Hi Guys

A general "engineering" query

On my road derailleur, the cable stop screw does not screw into the metal of the derailleur but into a seperate "spring like" coil of metal which it would appear has been pushed into a smooth hole in odrer to provide a thread for the allen bolt.

What is the advantage of this over just putting the thread straight into the metal of the derailleur and what is it called?

I ask as the Metal coil has come loose thus nessecitating a whole new derailleur!! :evil:

Cheers
davek

nicklouse

a push fit? not a threaded insert like a helicoil?

harder wearing surface so less likely to strip the threads.

ddraver

ermm, this is getting toward the edge of my shocking mechanical knowledge nick - I would guess it was a helicoil - but that it has "unthreaded" itself from the derailleur....

nicklouse

what mech?

you may get away with getting some metal adhesive/bonding agent in there.

ddraver

SRAM Force - thanks for your help, will have a looksee!

nicklouse

I think we have one in bits in the shop. Will have a look tomorrow.