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A couple general notes about renting weapons:
Keep the packing material around so you can pack them up neatly for the return trip.
Take care of them. They aren't ours and we don't want to be on the hook if they break.
Keep them safe. Make sure they stay in the office and people don't play with them. This can't be emphasised enough.
Make sure to rent one more than you need. Weapons do have a way of breaking we you least want them to.
If you're renting them for spring semester, the buffer for returning them can creep up fast. Either do it before leaving for spring break or right after you get back.