How is the wood for a shaft blank cut out of a tree trunk? Is the wood taken from a slice that is perpendicular to the trunk or from wood that runs parallel? If it is perpendicular does a 29" shaft come from a tree that has a diameter of 30 to 32 inches or from one that is at least 60 inches? If perpendicular do the blanks radiate from the center or do they just make the circular slice into a 29 in square and cut as many as they can from that square?