I will be starting a project soon with a bike that has no BB cable guides. And I want both front and rear changers. The bike apparently used a clamp on type like the one pictured below but it's long gone. Anyone know of a source of these or an alternative approach? I should note the right chainstay does have a housing stop on top, back by the rear dropout, so I do want to sort out a way to route a bare cable through this area, above the BB.