Quick note: the number 2610004610 is a Dremel / Bosch locking pin (spindle lock)

Product description:

Genuine Dremel spindle lock (part 2610004610) — a push‑on locking pin and spring assembly used to secure the motor drive shaft when changing collets or accessories. It installs one‑way onto the chuck/key slot and includes the matching spring so the lock stays positively engaged during accessory swaps. Fits Dremel multi‑tool and router models in the 4000 / 8200 and 8220, Ideal as a direct replacement when the original shaft lock is worn, loose, or missing — a simple, precise repair part for power tool parts maintenance.

Compatibility and notes:

- Commonly listed for Dremel 4000, 8200, 8220.

- Supplied as the locking pin plus its spring; install carefully (it’s pushed on in one direction only).