Flat to V pulley interchangeability

martik777

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I'd like to convert my V pulleys on my 1945 9A (horiz drive) to the flat belt style. Are these interchangeable?
 
The later models of the 9" South Bend lathes made after about 1938, the sheaves or pulleys are interchangeable. I have compared measurements bores of a few headstock sheaves I've hoarded in the last few years and they are well within a half thousandth of each other. Ken
 
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