I do what everyone else does:  I cut the feathers with some wire snippers just where they come outta the skin on the wing.  I NEVER use that far up the quill anyway, and trying to jerk those big feathers out of the wing requires a lot of muscle (and you can damage the feathers if you slip).  
Just cut them, or use a hacksaw to saw thru the quill.  Hell, you could even burn the quill with a very small flame, but that's risky.  Not to mention it would smell up the whole house, so do it outside!