I've had trouble with the rear spring screws on mine, especially the one that threads into the colored plastic case extension, so I modified it a bit. I drilled a hole in the rear handle so I could use a cap screw inserted down from above, and a nut and star washer. I had to cut the cap screw to the right length. I also added a star washer to the screw that goes into the black plastic handle. It's worked well.