Mickey2

It's just as likely to get stuck because it's frozen up and needs oil. It takes quite some effort to get oil to dribble along the horizontal axle all the way out to the stop motion screw (a.k.a clutch knob, etc). There is an oil point on top of the machine, just to the left of the balance wheel. Poke down it with a tooth pick to ceck if it's clear or clogged up. Tilt the machine towards the right (place a book, folded towel or something under the left side of the machine), then add one drop of oil after another to this oil point, turn the hand wheel and keep on adding oil. If you just add oil to this oil point and don't thick much more of it, the oil will just dribble down the vertical axle and the horizontal axle which the hand wheel and cluch is fitted on will usually stay bone dry. There's not much point in fuzzing with the setting screw on the chromed knob until it's loose. Once freed up it can be taken off, cleaned and oiled if needed.

Trilfow is nice it has added teflon which make things run very smootly, and it's very good to unstick gummed up parts. Keep on using the oils you have, they will do the job, and when you get your hands on a bottle of Triflow just switch to it.