Are you thinking of the Schils family...They sponsor http://www.veloschils.com/index.html
They're The Essex Dutch importers Interbike
. They're frame archive here.
I've only ever seen one Diavolo frame...Columbus Cromor lugged roadframe, not light, but reasonable. Vaguely remember being told it was made by Italian prisoners, Girardegno?
...The internal rear brake cable was just 2 holes with rubber grommets.
Italian BB threads.
Ninety's one here
looks pretty similar.
Was Diavolo one of Schils' own brands?
All the best,
Pause, take a breath and ask yourself: "What would Rastamouse