Original DeWalt blade adaptor 604770-00 — a small clamping washer that fits inside the blade-flange assembly to hold the saw blade securely and keep it running true on mitre/chop saws.

Example compatible models include DW706 / DW706E, DW708, DW716 (and DW716 EXPS variants), DW717 / DW717 XPS, DW718 and DCS727.

This is the original DeWalt replacement part sold individually; it installs quickly between the inner and outer flanges during a blade change and restores proper clamping pressure without modifying the tool. It’s an inexpensive, commonly replaced item among power tool parts.