Castle AT-8 Diagnostics Manual - Manual (Page 4)

3. Check that the tabletops meet evenly by running your fingers across the seam on the top of the
table. If they don't meet perfectly, gently tap the half that is out of alignment with a rubber mallet.
4. Tighten the tabletop nuts down completely once they are level.
3. Adjust 10 x 1/4 screws that hold the tabletop to the frame.