I have used sewing machine oil for flattening the bottom of planes, however
and it worked well.


Really? That is what I am doing now with a stanley #4 type 19, on sand paper
which is on thick glass, super 77 and dry with no oil, but what is your media,
a tool or the same as what I'm doing?

This plane was used a lot for a long time but it was never tuned, the factory
grinding marks are still on the sole and still a lot of hills and valleys. Wanna
get it real smooth.

Alex