Originally oiled from the factory, now the oil is either dried up
or gummy.  I can clean the old oil off the brass with naphtha, but what
weight or type of oil might they have used originally?

I thought of Singer sewing machine oil, but it's too expensive in
those little 2-ounce bottles.  I want to get a quart of what would be
best.

Dave Krall
Hammond, Indiana