RCBS has about the best customer service policy of anyone on earth! Give them a call, or e-mail customer service and I'm sure they'll fix you right up.
Now, to balance a beam scale (non-electronic) here's all you do.
1. Find a good stable, level, draft free spot to set up the beam scale. Make sure you check the surface with a spirit level. Place your fingertips lightly on the table surface to check for vibrations, OK?
2. Make certain all the slide weights are set over the zero "0" notches.
3. Observe the beam readout/pointer to see if it lines up with the center mark on the frame after waiting for the beam to settle down from swinging. If it does not line up in the center exactly, move the large Jack-Screw Leg under the frame to bring the beam centerline into exact center.
*If you cannot get it to balance, check to see if the beam knifedges are in the center of their cradle and freely moving.
Jim