Ted, welcome to CoffeeSnobs,
Like the Breville Smart Grinder, some Sunbeam Grinders can be modified by adding shims (thin washers) under the burrs.
Give Sunbeam Customer Assistance a call, tell them what your grinder model is and ask for shims.
Do you have a Sunbeam agent in Argentina? If so contact them.
A trap for young players, when removing the lower burr on the Breville, it is held on by a left hand threaded nut. The Sunbeam may be the same.