i wouldnt go below a 1/32 because even a 1/32 is a pain to cast for a spinner bait since they seem to catch the wind...i would say a #4 for 1/32 #2 for 1/16 and #1 or 1/0 for 1/8....i make 1/16 and 1/8 and you really dont need nothing beside them two sizes