[Paddlewise] Rudder mounting

Paddlewise paddling people:

My wife would like me to add a rudder to her kayak. There is currently no 
hardware for mounting one. I'm trying to decide between doing an end poor 
and bolting on a rudder, such as this model:

http://secure.seawardkayaks.com/ecbuilder/item177.htm

My other option is to get a universal bracket and add a pin-type rudder, 
such as these two products:

http://www.bearmountainboats.com/onlinestore/popup_image.php?pID=102&osCsid=eccb6280eb30daf2ffb0d5b38c100b4b

http://secure.seawardkayaks.com/ecbuilder/item170.htm

It also begs the question as to which rudder mounting scenario presents the 
least amount of drag in terms of the actual mounting hardware - not the 
rudder. The bolt on Seaward rudder depicted in my first option, while 
obviously the strongest, may impose less hydrodynamic efficiency due to the 
drag the mounting hardware presents to the water and the bulkier design. 
Anyone have experience between the two?

Doug Lloyd (who's wife is rudderless in Victoria) 
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