Razor back thread size?

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DJackson

'Lil Knee Scuffer
So I have pre 65 razor back stem that should clean up nicely if I can fix the clamp bolt. I was thinking I can drill it and Chase the original threads, does anyone know what thread pitch is original?
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49autocycledeluxe

Cruisin' on my Bluebird
probably has goofy threads if it is Schwinn. I say give it a few good soaks in PB Blaster and remove it with a pair of vice grips.
 
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