Chris:
I can’t afford a machine for watches either, so I purchased a cheap disco strobe light that I MIGHT be able to set with a cheap stop watch. I also bought a little stand that I think I can modify to work about like that little hairspring vibrator that you have. If I can get the strobe set to 5 flashes/sec for the typical pocket watch then I might be able to check the timing for them without spending more than $30.00. Of course, if it doesn’t then… what the heck will I do with a disco strobe? 
Later,
Tom