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Our powermatic 66 tilt mechanism is slipping as though there is a stripped lock pin. The manual doesn't even indicate how the handwheel/shaft connects to the saw tilt bracket, but my guess is it is this hex piece I indicated in the photo. It looks stripped. Our saw has a differential right in this region that can tilt the blade or raise the saw cabinet, so that hex piece fits into a sleeve to its right. Has anyone experienced this problem before? Am I diagnosing it right? The blade tilts to 89.8 deg and 45 can be reached if you push with all your weight against the handwheel (toward saw cabinet). Saw is usually cleaner than photo but my boss loves white lithium grease (and its so thick and collects dust into a paste. thoughts on this welcomed too). Do we need a replacement part? and if so, do we need a new lock pin? or is it something else?

Thanks for any and all help!
Kelsey