What is this ?.....

......and where do I get one?

It is some sort of guide I've never seen before. It stops the standard outer cable pulling through the frame. Any Ideas?

I used to have them on a Sintesi frame I had many moons ago, they give you the option of doing a full run of outer cable to the rear mech or running shorter bits with end stops, that one looks like it was knocked up on a lathe by someone... looks like brass ?

I've no idea where you'd buy them.

Some help I am...
well, thats actually a cable stop yoke from an ancient proflex beast !! you should be able to get a plastic yoke to do the same job..i put that on the cove cause it was shiny !!
hey,

i also used to have them on an old sintesi moab frame, i think i still have them if you want any. they're aluminium ones, near exact same as in that picture. Let me know if you want them and i'll have a root for them.

cillian
dont bother just run a single outer sti casing all the way down the frame as the bike was designed to have
Is that me old Peeler?
If so who owns it now?

I agree, run full cables. That's what I had on it. Less chance of dirt getting on the cables.