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I meant could the size of the blade be determined by what fits in the scales which could be determined what fits best in your hand?
Tim[/QUOTE]

Oh I see ~ but have no answer :)

No, your hand controls the pressure on all blades, just you can be lazy with the heavy 'uns.
Not clear on the "scales fit in your hand etc" question.

Japanese kamisori range from about 1.6" to about 2.4"
I find the 2" length perfect & it is my preferred razor.