Sorry guys another quick q.  Just got a simple bog standard pull up push down centreboard.  Was wondering what system/block arrangement people are using for raking the centreboard?  Ive seen shortcord around hoop with a double and then another double coming of the board or something along those lines.  Just wondered if anyone had some pics or advice?
Thanks

Here are some pictures - i think you need to know what you are looking at for them to make sense though.
I want to rig one of these but the cost of the bits seems to be rather a lot.

there was another post about this recently, if memory serves me correctly.