Today my front brake lever started jamming. It sometimes jams just as I begin to pull on the lever. If I let go and try again it usually works properly, in that I can pull the lever all the way down, particularly if I lift it upwards a bit before I start to pull on it. The lever is attached to a V-brake, but even if I disengage the lever from the brake, it is still prone to jamming, suggesting that the problem is in the lever and not further down the cable. I tried lubricating it, and that has helped a bit, but it has not completely solved the problem. The lever is several years old and feels quite loose, in that I can tilt it up and down quite a bit, in addition to the backward and forward motion that it is supposed to have. Can it be repaired, or is it simply worn out and in need of replacement?