re: Adjusting grandpa's plane

I do not have that specific plane but I do have block planes that have the basically the same type of wheel to hold the blade tight.  I usually use something small like a tack hammer to tap if forward and laterally to get it straight.  I back off the wheel slightly to loosen the blade a little and it only take very light taps.   Retighten and test.  Mine are not double ended so backing the iron out a similar light tap at the back end of the plane will back the blade out some.  For yours, I would probably use a small wooden mallet  to avoid marring the plane.  You can use a wood mallet to move it forward too if you have one that is small enough.