I have 2 Kfactor 90 Asian specs. I had them weighed at the Post Office. One weighs exactly 12 oz. and the other is 11.9 oz.. Where do I add the extra ounce I need and how much will it be (lenght/width of the lead tape). Any help would be great!

The 0.1-oz. difference = ~3g = 6" of 0.5"-wide lead tape. To see where you need to add the tape to match, you need to measure the balance points. Do this accurate to at least the nearest 0.5mm. Then calculate where on the handle you will need to center the 3g on the lighter one to make it match the balance of the heavier one. r = (R'M'-RM)/m r = location of added mass R' = balance of heavier frame M' = mass of heavier frame R = starting balance of lighter frame M = starting mass of lighter frame m = added mass