I'll try to explain this the best I can. They are second-hand Dia-Compe aero brake levers. Can''t find a model number, but they're older (circa '90s likely).
Here's the problem: When I slip the brake cable housing into the hole there's nothing to stop it from going all the way through. Without the housing secured, if I pull the lever the housing would move with the cable and the the brake wouldn't do anything.
I figure once the housing is taped to the handlebar, it'll work just fine, but am I missing a part? The hole is big enough to accommodate a ferrule slipped over the end of the housing. I'm thinking a ferrule with a mushroomed end (the end that slides onto the housing) would work.