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Paul,

I think I see what's happening.  In distutils/command/build_scripts.py, at the end of the copy_scripts() method, there is a call to self.copy_file().  You should be able to add a keyword parameter preserve_mode=0 to that to fix this.  If that is not sufficient, please let me know.  (The existing build and installation of your package will need to have the write bit enabled before this will work, unfortunately, but this should take care of future installations.)

Please report your results, and I'll get this checked in if it is sufficient.  Thanks!