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If you haven't done so already you need to clean out the inside of the tube or it will happen again. There's probably a better tool for the job but I bought a long metal pipe cleaner in the plumbing section at home depot. I had to squish it down with a pliers to make it fit in the tube but I connected it to an electric drill and bored it out, WD40 helps loosen the crud. I then use a dowel, and paper towel to push all the crap out. Use a good lube with anti corrosive properties before reinstalling and that should last a couple years.