Join Date: Jun 2006
Bikes: 03 Raleigh Professional (steel)
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Talk about providing the bare minimum of info! You want help, help us help you. I'll assume you're using a Hollowtech II crank as pictured.
You cannot change the axle or axle length on the crank, or the implied chainline. The "bottom bracket" is simply two screw-in bearings separated by a spacer tube. They screw into the frame so the size, thread, and handedness must match.
Is your problem that you can't find a 73mm BB? (I don't recall seeing one.)
How could "grind down" a shell that's already too small?
Stupidity got us into this mess - why can't it get us out?
- Will Rogers