I forget, you have to push in or pull out on the knobs as you turn them to get them to move - check your manual. I have a parts machine someone took a hammer to to get it to move. I would not use pliers or a hammer - bent parts will not work at all ever again. Those have very close tolerances. You may need to drape the machine, spray a little brake cleaner into a can then dab some on the post with a natural brush or q-tip - that stuff will eat your paint, do in you liver if you breathe the fumes and shrivel up any plastic in sight but it should vaporize the dried on oil instantly.