Today I took the wheels off of my Metro HP 36 because the machine was making a funny noise. On BOTH SIDES.....the zirk (sp?) fittings are missing and bearing reservoirs were dry.?? There's just a hole there. Bought this machine used. Can you provide some guidance? The local auto parts stores fittings don't 'fit'. Thanks. By the way I don't know if it would be possible to even get to these fittings unless you take both tires off anyway. Maybe that can help you visualize where they are.