I have one of these in my shop to clear the path. This tool will do the job most of the time. If it won't then "Heat" as noboD said previously.
You fill the tool with some light solvent or oil, place the tool over the zerk and tap the tool with a hammer. The high pressure created will typically clear the zerk and path.
Good Day!
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Growley Bear, new at this so where is the best place to put jack?