A file is the quickest way. Another way is to screw two nuts on the screw locking them together with the 1mm length exposed and file or use a belt sander to cut off the excess length.
For me, with older eyes and less acute motor skills I used a Wire Stripper that has metric screw cutters including M4 I got on Amazon for $20 ( 8PK-CT009 Multi-Purpose Pliers Crimping Tool Metric Size Wire Cutter Cable Stripper ) Expensive but I didn’t want to ruin the factory M4 mounting screws since they have a smaller head than standard M4 torx screws which will not fit flush in the 507K like the factory screws and I couldn’t find any suitable replacements. The screw cutter will recut the front threads of the screw after cutting it and unscrewing it from the screw cutter.
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