Disc for Polar Knife Change, 274584, M654
This disc is part of the knife change device on Polar Cutter models 78 and 92, such as the 78X, 92X, and 92E models. The original Polar part number is 274584, and 061280. Also included with the disc is a replacement Socket Head Cap Screw, Polar part number 203403, or 451642.
These disc rings are the revised versions with fine pitch screw threads, and a fine pitch thread on the bolt.