PC Modification For Use Without The Handle

Does anyone know off-hand what the thread size is on the PC 7424XP handle?

I wanted to pick up a couple bolts on my way home today, but forgot to bring the handle with me to compare sizes with.

I want to place the bolts where the handle screws in to the head of the polisher to help hold the plastic housing in place as well as keep any rattles to a minimum.

So does anyone happen to know what the thread size is?