I have a a delta DJ-20 jointer that's about 20yrs old. I was checking the coplaner on the infeed out feed sides iofthe table. Both the infeed and outfeed are very flat as measured with a48" Starett straight edge.However ,when the straight edge is placed across the out feed side tothe in feed side a gap of .007 exits on the in feed side closest tothe cutter head.I don't see any simple adjustment screws and Idon't have the old manual.Does someoneknow howtoadjust this?