JP6 Piezo Switch Shaft Size

I have a 2002 JP6 with piezo pickups. This past weekend, the nut to the piezo switch fell off while on stage and I couldn’t find it. The crazy thing is that I have a lot of rando guitar parts including nuts for pots and switches. However, none of them are large enough. I even have some brand new pots and their nuts are too small too. I have been searching, but can’t seem to find this spec and I really to fix my guitar.

Can someone help me out and tell me the size so I can order an…

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