Tuned up my Stanley "Sweet Heart", however...
I got out the books and the papers and the articles and I tuned up my ancient Stanley Sweet Heart jack/bench plane. It is in good condition (that is not "good" as a technical description, but better). The steel is fine, the wood is fine, there is no rust what-so-ever, the blade is true, all of the Japaning (I think that is the right name for the metal finish) is all intact, etc.
I have the frog flush with the sole.
I have the cap iron 1/16" from the cutting edge.
I have the bevel down.
The lever cap seats well.
Everything is square with the sides of the plane.
You could shave with the blade (thanks to WorkSharp 3000...not my skills).
The problem is that the rubber does not meet the road...The blade does not reach the wood by a couple thousandths.
If I move the frog it won't line up with the throat to support the iron.
If I move the blade down it will extend beyond the cap iron the recommended 1/16".
I have the depth adjustment wheel turned to the maximum depth...there isn't any more to adjust.
I hate to sound so dumb...however, it appears that is the way it is.
The throat gap is a line thickness less than 1/8". That seems like the Grand Canyon to me.
I don't know if it helps but: Sole length = 13 5/8", Sole width 2 1/2".
I believe that the correct expression here is, "HELP."
First of all you have to be smarter than the machine.