the bamboo bows i tiller with the lams between the boo backings,they are 0.1000,0.2050,0.3050 thds per running inch, the tiller is more or less in the math.then the addition of boo stripes are factored in,and sdjusted accordingly,its very time consumming,and a pain in the butt.but i come out with a nice bow,early draw weight,and a much different appearance than most other all wood bows.im now working on a self bow for a fellow when i get it finished i will post it. robustus