I made four mods to my Corona (thank you, The Knack) and have been using it for over a hundred batches since
1) Add the side washers as noted by
@Mothman , previously by
@Revvy
2) Filed the hub on which one plate rests to better "parallelize" the two plates
3) Used nail/bolt like in
posts 73-5 to keep plate in place. Note that I did not jbweld/5minepoxy the shaft to the plate--just the bolt/nail
4) Bought the 13mm bolt to extend and use 13mm socket in drill to power
I did mount in bucket, hopper connection level with bucket top, and made Formerly-Apfelwein-Applejuice-Jug hopper and use a piece of posterboard over all to lessen dust. Forget eliminating it, fool's errand, strap a furnace filter to box fan and run it while you're milling.