A few years ago the Kondinin group in WA (farmers reasearch group) done a test comparing fluids to loosen rusted nuts. Acetone was not in their tests. They compared many commercial fluids plus some homemade brews. Diesel/kerosene 50:50 came out as good or better then all the others. Have used it ever since with good success.

Glad to hear that the saw was fixed with out any dramas

Peter