Filament Alarm Microswitch mount

A simple housing to fit a standard 20mm short-lever microswitch.
Comes in two halves so filament does not need to be threaded through it.
Switch is mounted with 3 mm or 2-56 screws and nuts.
Direction of filament travel should be FROM the lever hinge TO the lever tip to avoid scraping or binding the filament. (see photo; arrows on case are reminders.)
Hold halves together with a binder clip.
Wire to any dollar-store personal alarm you have lying around.
Threw this together in an hour with stuff I already had.