201 CYLINDER TOP PIN SPRING

Lockwood 201 Top pin / chip Spring

Housed within the cylinder, the top pin / chip spring sits above the top pin / chip , which in turn sits above the bottom pin / chip . The top pin / chip spring drives the pins / chips into the barrel / plug and when no key is present prevents the shear line being formed between the top pins / chips and bottom pins / chips which would allow the barrel / plu to rotate within the cylinder and thereby lock or unlock the Rim cylinder.

When the key is engaged in the barrel / plug the bottom pins / chips sit within the bitting of the key pushing up against the top pins / chips and top pin / chip springs to create a shear line between the two sets of pins / chips , allowing the key to rotate the barrel / plug within the ctlinder and thereby lock or unlock the Rim cylinder.

Bottom pins / chips range in size from 0 to 9 allowing the keys bitting code to be matched within the cylinder.