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The problem with that method (apart from the inaccuracy) is that you are bracing one pair of stays bike against the other.
Differences in materials and construction, mean that one pair will be stronger/stiffer/more rigid than the other.
The result being that one side of the frame will move further than the other and your bike will be lop-sided.
If you must spread the ends (it's only 2mm either side and not necessary), then follow Sheldon's method.
Scilly.Suffolk
I am currently using the thread, nuts and spacers method. I've stretched my 126 out to 140 and am hoping once I release it, it will spring out to about 130 somewhere. I've used digital measurer and it didn't make any funny noises. I have no idea if leaving it for a couple of days will make that much difference?