Do all the front rails look alike? Shopsmith had to redesign the front rails for the scales so while I have no idea if this could happen but maybe you have a mix of old and new rails?
Ed
tdubnik wrote:I had a 500 that I upgraded to a 520.
The 510 in the profile was a typo.
I bought an upgrade that was manufactured in 2003 but never used. The upgrade came with a new main table, extension table and 2 floating tables. The front and back rails were attached to all of the tables when I received them. The main table and exension table and one of the floating tables are all in alignment but one floating table is about 1/8" lower than the rest. As I said before I loosened the front rail but it doesn't move up or down.