Ok let's try the nose plate again.
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I also worked on a yellow clone earlier this week. It was in very nice shape. Then I tried to sew. Something was wrong with the tension maybe. So I took a hard look. The tension unit was not seated into the housing quite right so I took it out - the spring was bent and not in the channel. Got that cleaned up and tried to sew. Nothing. So I put a nose plate from a working machine on it. Nothing changed. Then I checked out the bobbin case - it checked out ok. I traded it out anyway. Nothing changed. So I looked hard at the shuttle. There is a little spring in the shuttle and it was loose. I tightened it up and WOW that machine works wonderfully. It is very much like a new machine.

Here is my 15 clone, made in Japan for a department store that use to be in St. Louis,MO. It was given to a Grandson and I gave him $100.00 for lugging it home. Sews beautifully and had never been used. It needed a new belt, oil - lots of it and a bit of grease on the spindle next to the motor, it would get hung up and break the thread. It is a Vandervoort, that was the name of department store.
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I like your Vandervoort. Where did you find the blue belt? Most clones had motors added to them after they got here in the states depending on the customers order and specifications.
~G~

My newest 15 clone - just picked it up last night. No idea what "name" it used to say.

Take a look at the flip top bobbin cover plate though. I like that!!

I guess you can name that one anything you like - real nice machine.

It looks like it may have said "Stitchmaster" to me.
~G~

Sounds about right .. the closer I inspected it I can tell that the first half was definitely "stitch".

That is one name on a clone that I have seen a on a few machines before. The script comes in at least three different designs or fonts that I have seen so far. Clones are GREAT straight stitch machines. Your looks like it is in great condition too except for the name.
~G~