Hobie Adventure Rudder Sticking

Anybody know what to do when the "up" cable on the hobie rudder sticks (i.e. fails to work)?  It was pretty hard to pull up before, now it just won't go.  I obviously don't want to pull too hard lest something break.

sometimes you have to back the nut(9/16ths,14mm) off where the rudder bolts to the mount just a touch. I give it a spray with dry silicone spray(spendy) also, keeps everything working nicely.

the up/down needs to be adjusted occasionally also.

Detailed Twist-n-Stow rudder assembly instructions are located here: http://www.hobiecat.com/support/index-kayak.html

Repair manual here:
http://www.hobiecat.com/support/pdfs/Twist-n-Stow_Repair_Manual.pdf

Adjustment guide here:
http://www.hobiecat.com/support/tech/twist-n-stow_adjustments.html

Thanks guys - this is very helpful!