Made to be used with spring-latch compatible spacers, first made available on 4/11/2022

Carbon steel extension spring, made custom for my products. You may be able to find something that fits at local hardware stores, so here are the specs for reference:

ASTM A228 music wire
OD: 0.094”
WD: 0.012”
L: 0.55”
Hook type: Crossover center, closed