That's strange...your comment made me check mine, and no way does mine come close enough to hit anything. I have about 1/4" clearance to the bump stop. It's not the counterweight locking thumb screw hitting is it?Occasionally depending on how you rotate the handle the counter weight will hit the bump stop.
The counterweight should be attached with that screw at the bottom. I just tossed that thumb screw and use the hex head screw only.