[TR] tap size help

[TeriAnn J. Wakeman]

I need a tap and a die for the post and nut on a Lucas sft576 auxiliary 
light and I don't know what size it is. Looks to be 5/8ths by a super 
fine thread. It is finer than national fine. Anyone have any idea what 
size I'm looking for?

Thanks,

TeriAnn

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