North Carolina Locksmith Practice Exam 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 435

Which component of a cylinder serves as a plug retainer and determines the cylinder's finish?

Shim

Scalp

The correct choice is the scalp, as it specifically serves the role of a plug retainer in a cylinder mechanism and influences the final appearance of the cylinder, known as its finish. In the context of lock mechanisms, the scalp keeps the plug securely in place while also contributing to the aesthetics and functionality of the cylinder.

Other components, such as the shim, shell, and spool pin, serve different purposes within the locksmithing context. The shim is usually involved in the bypassing of a lock, the shell refers to the outer casing that houses the internal mechanisms, and the spool pin is a specific type of pin used to enhance the security features of a lock by creating false sets during picking. These elements do not retain the plug or define the finish of the cylinder as the scalp does.

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Shell

Spool Pin

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