INO Universal Model 1641 Manual?

I just bought it at a yard sale for $50, Looks to be atleast 10-20 years old. No manuals or extra parts (feet) ect... It works fantastic, was just wondering if anyone knows where I can get a manual for it. I searched the typical manual sites online but the model #'s they have don't match mine. Should I get a manual for a different model - will it work the same ? It is a Model 1641 Serial # 0271

Thanks a bunch to anyone that can help.