RPF PREMIUM MEMBER
One trick I did with the hinges in my helmet was to get a piece of threaded rod the same pitch as the Chicago screws, and cut it to length so it was about 5/8" shorter than the width of the inside of the helmet. Once you figure out the correct mounting position, put the receiving end of the Chicago screws on the rod and adjust them so the rod fits snugly against the helmet wall and epoxy it in place. This way the mounting points stay parallel, and the hinge works smoothly. The rod diameter isn't very big, so cutting it in a couple places with a pair of cutters to unscrew the rod from the mounted screw ends is easy.
I agree! This is a very good tip... simple yet very effective. I had not thought about it. Thanks for sharing.