#define screw_width 9
#define screw_height 9
static unsigned char screw_bits[] = {
   0x70, 0x00, 0x48, 0x00, 0xa8, 0x01, 0x48, 0x01, 0x14, 0x01, 0xe2, 0x00,
   0x11, 0x00, 0x09, 0x00, 0x07, 0x00 };