c-clamp response
I go to the hardware store and where there are lots of hook eyes, clips, and other general hardwre.  Basicly the are arod bent 180 degrees withthreads on each end and a metal plate that fits over them.  The c part fits nicely around the post.  I think it is the 2" c-clamp or the 2 1/4" one, mesure your post.  The plate will bend when you tighten the nuts so I re-unforced with another plate.  At my hardwre stores we can get the angle peices you see that are predrilled with holes.  They are 1/4"  holes so are ok for the c-clamp and plate.  I used a 3/8" threaded bolt for more rigidity so had to dril out the holes.  There are three pieces to the rudder post attachment.  1. the c-clamp bolt, 2. two pieces of the angle pieces turned 90 degrees to the c-clamp through which the threaded bolt goes 3. a piece of the angle iron as pictured to reinforce the plate on the c-clamp.  Sorry I can not explain it better.  i hope between the pictures and words and some expiermenting(sp) you can see what I mean.  Corky