SJ finger throttle screw size

Location
MI
Does anyone know the size of the threads in the screw that holds the finger throttle in place on the handle bars. I cant get my grips off so i cant bring it in to the store.
 

Ducky

Back in the game!
Location
Charlotte, NC
Can you find anything screw the same thread size/pitch on the ski and take it to the hardware store to get the correct screw?
 
Your picture shows a stock Yam throttle. It is kept from rotating by screwing a small capscrew ( with built in washer) thru the hole and into the stock handlebar. I think it is as yamabro indicated : 5mm x about 12mm long.
 
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