Joined: Feb 2012
Posts: 19,352
Likes: 5,469
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Most older bike don't have BB threads that are buggered enough to need a real chasing with a tap. Some do, but this is part of doing business. Either you invest in tooling (whether home made of bought) or you learn to be good with walking away from a project and that bike becomes a donor for other projects or a lesson in the cost of doing what you do.
If mere corrosion is needed to be removed the wire wheel on a drill works pretty well for little cost.
This is but one reason that shops that have to pay employees and rent shy away from used bikes. Andy
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AndrewRStewart