The brake quit working on my riding mower and I really need the brake up north when mowing a fairly steep hill. No big deal, thought I, just replace the 25-year-old brakeband, right? Wrong. Upon further investigation, turns out the shrouded cable (like brake cable on a bike) needed more "pull" than the spring in series with it could provide. It was binding. Well, gosh, it's 25 years old too! I removed said cable, coiled it up and put it in a can with some lacquer thinner to soak for a while to dissolve petrified lubricant within while I made a tool on the lathe as follows: bit of 1/2" dia brass rod, one end drilled and reamed .3125" to fit snugly over the ferrule on one end of the cable, other end threaded to fit the compressed air blowgun valve. Fitted said fitting to ferrule, applied 90 PSI air. From the other end of the cable emerged a string of what looked like extruded turkeyshit. Nyahhh! Squirted some lacquer thinner into the brass fitting with a syringe, reapplied air hose. Dirty lacquer thinner shot out the other end, onto my once-white tennis shoe. Oh well! Kept blowing until fog no longer emerged and the inside was clean and dry. Injected some TriFlo teflon-loaded light oil into the brass thing and blew that thru the cable while managing not to spray my shoe. Now the cable pulls freely even if tied in a knot.
Then it got dark so I quit for the day, but I'm hoping that'll do the trick.