P Patrick Williams New Member Aug 3, 2018 2 0 1 57 Aug 3, 2018 #1 Hi. I just bought a 2010 Grubee GT5 66cc 2-stroke. The nut that holds the front sprocket on is missing. Does anybody know where I can find a replacement? Or does anyone know what size it is so that I can find one a hardware store? Thanks.