On 18 Feb 2012, at 14:53, Marcel Kilgus wrote:

>> On 18 Feb 2012, at 11:13, Tony Firshman wrote:
>>> I will design a tool to add the extra 1/4" diameter  (8-)#
>> Can you do it in millimetres?
> 
> He has to, because unlike a 5 1/2" disc, which really has that size, a
> 3,5" disc is in reality a 90mm disc. This is only roughly 3,5 inches
> (3,5433 to be precise). ;-)

So both 3.25" and 3.5" are underestimates.

George
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