KitchenAid KHM3 Classic Hand Mixer "slot permanently locked" Questions

...locked up firmly with the grub screw that is accessed with machine upside down on a towel. It is right up the middle of the pedestal. Next fit bowl & flat paddle and adjust head height with the ...

KitchenAid Hand Mixer Beater won't stay in slot The beater with the extra collar will not lock into place, it falls out before I even get it into the batter. Can the "collar-grip" be replaced? Where ...