Procharger Pulley Bolt Size

Thought the bearings on my P-1SC were toast due to a pretty bad noise, when I took the head unit off to check the shaft for play I discovered that the bolt for the pulley somehow managed to work its way out and be lost forever. I'm not exactly excited by the idea of lugging that thing into the hardware store to find a replacement bolt, does anyone happen to know what size the replacement should be?
 
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