Brute force huh? Been there.
There are other ways of mixing it up in kegs…
Except those Delta kegs are based on yeast brinks And have that 1.5” ferrule down low on the side…so methods 1-3 are out 
There are cheaper places to get it. Don’t get fooled by the DC408, which is shorter. Or get one that isn’t stainless.
Put it on a decent drill and it will do a great job mixing biomass in a keg too.
4 Likes