Campagnolo Ergopower Cable Question

[Tony T]

The Campagnolo Ergopower Cable set includes 5 end caps. 4 regular and 1 with an 'extention' (see endcap in picture on left)

What is this special endcap for?

http://www.chainreactioncycles.com/Images/Models/150/58090.jpg

[AngryScientist]

chainstay cable stop on certain bikes. i know my Serotta uses one there.

[DRietz]

That's a step-down ferrule. Some people use them going into the rear derailleur, others, the chain stay as AS mentions.

[Tony T]

chainstay cable stop on certain bikes. i know my Serotta uses one there.

Ah! yes. And it's even in the instructions. Thanks!