This book seems to present information but basicly is useless. Start with the misnumbering or lack of numbering of the illustrations to the willy nilly mixing of advice for compound bows wtih recurves (does my compound bow really have a cushion plunger) to the haphazard blending of the workings of single cam, dualcam amd hybrid systms and you get less info than the dvd or youtube videos freely availabe. Not worth the postage to send it back.shame sham.