This is the spring used for the "helping hand" part on the trap.
Vintage Mouse Trap Spare Parts HELPING HAND SPRING Replacement Ideal MB Games
Hasbro Gaming Mouse Trap Board Game for Kids Ages 6 and Up, Classic Kids Game for 2-4 Players with Easier Set-Up than Previous Versions, Multicolor, One Size
MOUSE TRAP Ball - 2x Replacement Metal Steel Ballbearing +BAG Hasbro Game (2016)
MOUSE TRAP Ball - 2x Replacement Metal Steel Ballbearing +BAG Hasbro Game (2013)
