Effing mice! - Phil's Rambling Rants — LiveJournal
Clearly they like M&Ms. Simply Hotglue them onto the triggers so the mice cannot just lift them off without firing the trap. And clean the trigger hole where the clasp wire sits with a dab of vegetable oil (NOT WD40) to prevent corrosion from impeding smooth firing. Do not use anything but vegetable oil or the mice will be repelled from it.