I am looking for a guide for my Chandler Tacker industrial sewing mechanism. Any concept where on earth I could buy one?
I would say the internet is your best bet. You'll probably have to play around near the wording and whatnot while your searching for it (ie- put the model number then the label, or the name then the model number).
If you come up neglected there, I would suggest asking around at fabric shops or at places that go sewing machines. Or anywhere else you would deem appropriate.