Use your intended rod weight (10) as a numerator over 16 , and translate into an ounce figure . 10/16=5/8 , Find a spinning blank with an average lure rating of 5/8th oz. , sav a blank that is rated for 1/2-3/4oz lures would do the trick . This info is base on text that I've read on the rodbuilding board, I have never had to use it , but it has been given a number of time .
Good luck , JH