Used your video to dismantle mixer. Grease is separating and leaking oil. After grease is cleaned out I found the mixer didn't need any of the parts ordered. Worm gear looked brand new. Found out later that the mixer sat unused in a hot Texas garage for 2 years. Heat destroyed the grease. Replaced grease and put back together.
Will keep parts for the next one I find. This little project was a lot of fun.
Tools used
Various screwdrivers
scissor clamp to pick up parts
punches to remove/insert pins
brush with heavy nylon bristles to remove hardened grease
retainer ring pliers
lots of paper towels
mineral spirits to remove grease - avoid motor area