Turn knobs gently, no forcing if you meet resistance. It's not uncommon for machines to suffer from old, gummy oil and "freeze up." Hair dryer, more oil, and gentle, persistent turning. It could take daily or twice daily attention for a week or more.
When you look for movement at the metal joints, most comes from turning of the handwheel.
Last edited by WIChix; 07-01-2018 at 09:51 PM.