because I cannot manage 

.
I suppose I have not been taking in off, although it is in use regularly because I use it exclusively for pureeing fruit/soups, so have not had to change the blades. A quick rinse seems to do the trick; maybe that is quite minging and it is all now festered and cemented into place...
Anyhoo, I would like to be able to attach it to my as of yet unused mill, but can't.
Any ideas, oh Wise Ones?
So far I've tried olive oil, pliers, cold water, hot water, I would love used gentle force persuasion, but cannot find traction on the darn thing.
Help before I throw it against the wall!