My black OFR arrived today. I need to add .5mm at E strings and .2 mm at A and B. Do you know what can i use? It was late when it arrived and I tried every metal sheet y had, but I only got .23, .27 and .37mm sheets. I read that Coke cans are .1 mm, is that true? (I dont want to buy (10 plus 15 shipping. Shipping is 50% pricier as I live in Mexico) What would you racommend to match my 16" Rgt42dxfm radius?