They are usable. This is actually a feature that was requested for the OS collection. We intentionally selected screws that were a bit longer so that the lens could be inserted and taken out without having to take the screw out or so the hinge could be adjusted without having to completely disassemble the frame. This was direct feedback from the mission managers. See attached document regarding “special features” on page 10. This in no way affects the quality of the product, but is a requested benefit.
Some of the units have longer screws than others b/c Tristar accidentally manufactured some units with the standard screw length. We caught this mistake when samples came in and asked them to change it for all orders going forward.