Out at the range a few weeks ago I pulled a stuck ball with no problem. Tonight I tried to pull another ball, and never managed to get it out. I twisted and twisted and it never felt like it screwed in. I kept pulling it out and found small bits of lead stuck in the screw, but couldn't get the ball out despite trying for a good 10 minutes. Is there a technique to this as far as how much pressure and what it should feel like?