After a certain amount of usage, sometimes corkscrews will not remove the cork as easily as they once did. Sometimes it can be a function of the corkscrew itself, especially the electric version after several years of operation. But many corkscrews have a worm that can be replaced, as that can wear out over time. Once that new worm is installed in the corkscrew (typically the lever style) your corkscrew should work as good as new. If you replaced the worm and it still has a hard time removing the cork than it may be another part that needs replacement.