Process for replacing the stock Blendec Blender Jar two blade stock unit with the four blade Alterna cutter replacement unit. Process is to take out the existing cutter and bearing assembly. Fit the Alterna cutter by adding a stainless steel washer to provide a rigid base for the new cutter assembly which you can buy here https://alternajar-store.com/. Music by Bensound.com "Straight"