Power wheel screw size/pitch?

I feel like I’m not the only one here… my power wheel screw is MIA, installed a ring-loc cap, went to adjust the power wheel…. its nowhere to be found, searched the case, but its so damn small, i’m going to call it gone , lost to the universe.

Anyone know the size, thread pitch? Fastener supplier nearby, if i cant get an answer i might just take the wheel there tomorrow.