Sounds like you have a 2.5/2500 or a 3.5/2500. There should be a plate on the right rear of the machine. The company I used several years ago was.
600 Machine Tools
600 Group Equipment LTD
5220 General Road, Mississauga, Ontario L4W1G8
Tel: (905) 625-9611 Fax: (905) 625-4098
I think you will be supprised as to the cost of a new machine.
What type of back-gauge is on your machine? One was a double screw type the other a gear and pinion. I made some modifications to mine to include a travel-gauge and a differential screw to adjust the blade clearance. I can hold .005 cut tolerance easy. If you are unable to find help, advise as I have the operators manual & may be able to send you a copy.