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2) is there any other solution like re-threading (I hear that it is possible with italian threads, but wouldn't it be impossible to find a BB of 68mm wide with Italian thread, JIS taper?)?
Assuming this is a steel frame, your local framebuilder may be able to braze in a layer on top of the damaged threads then re-cut 1.37" x 24TPI BSA/BSC threads.
Switching to Italian 36mmx 24TPI is going to involve a 1mm increase in diameter, 0.5mm radius, so check how thick your BB shell is.
Finding two 1mm wide spacers to get a 68mm wide shell up to 70mm shouldn't be too hard. Alternatively, make some using the spacers used for BSA-threaded external BBs by sanding 0.5mm off the inner surface.
Emyr-
On a steel frame, I've had my local framebuilder tap the damaged threads out to Italian and then epoxy in an Italian-to-BSA convertor (like a very thin helicoil).
@paulbiche
Cupcakes
I have a damaged BB on my frameset, which is BSC threaded / 68mm wide.
At the moment, I have an Oxford threadless BB that I purchased from a French website (I'm based in France), that is solving the problem greatly but it is 116mm wide.
I need the 110mm wide, but when I purchased it again on this size on the website it is not the Oxford one, it doesn't fit (don't understand why, as if frame BB is too thin in width) and above all requires a chamfer whereas the oxford one fit well as it is.
1) Does anyone know where can I get the Oxford BB in 110mm wide?
2) is there any other solution like re-threading (I hear that it is possible with italian threads, but wouldn't it be impossible to find a BB of 68mm wide with Italian thread, JIS taper?)?