I don't know of a web site for a diagram, but you might get more info at
<!-- m --><a class="postlink" href="http://www.perr.com/forum/viewforum.php?f=2&amp;sid=3f504432eb333549d32f6459e7a920f5">http://www.perr.com/forum/viewforum.php ... 59e7a920f5</a><!-- m --> This is a very helpfull group and should be able to steer you the right way.