Do not crush it if you put the grinder head in a vise. You can use a rubber or plastic mallet to tap on the retaining ring. If it still won’t budge, get a torch and heat the retaining ring to expand, then tap sharply, but not too hard, with a light hammer.
Consequently, can you use wd40 on a grinder?
WD-40 can harm/dissolve certain plastics and rubbers (perhaps used in your blender). FDA only allows food grade mineral to be used for lubricating food processing equipment.
Likewise, how do you open a grinder?
Beside above, how do you unclog a kief catcher?
One of the easiest and most reliable methods you can use to clean your grinder screen is putting your whole grinder into the freezer for about 15 to 20 minutes. As the kief and resin are almost exclusively fat matter, this will make the kief clogged to the grid or surface of the grinder screen get hard by the cold.