Could it be that blanks being id'd as spin/casting has to do with the style of the handle? I'm sure that any blank can be made into either. I've known a number of folks who have used fly blanks for spinning rods. BTW if anyone is interested in getting into rod building this is an excellent site: rod building
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"Man can learn a lot from fishing. When the fish are biting, no problem in the world is big enough to bne remembered. " -- Oa Battista

VERY Homesick in San Diego