Not necessarily. It is possible to hoist the spin and get the head set but not the tack and visa-versa. <img src="http://www.catsailor.com/forums/images/graemlins/tongue.gif" alt="" /> I don't think the back-to-back block adds much purchase, rather it is an adjustment to get the head and tack set with the same effort.

'Course, I can screw-up most anything.