I don't have a solution since I never tried to fix mine but I can tell you mine has been doing that almost since I had the bike. 11,000 miles and this is my 3rd summer and no leaks just have to turn harder. Wendys bike doesn't have the problem. Hers turns easily.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!