I have an older scag 36" WB. It has grease fittings on the spindle that are smooth on the outside. I can't get a wrench around it because there are no grooves to catch. It has other grease fittings like on the front caster wheels that I can get a wrench around and loosen up. Has anyone had to deal with these and know how to remove the fittings to grease the spindle?