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I purchased one of their kit several years ago. That project is still on my never ending to-do list. The casting is well done. Stress relieved means it has been heated after casting to relieve the internal pressures so it wont warp after machining. In the old days, they would let the parts age a year or more to relieve the stresses.

Paula on Practical Machinist did a excellent article on machining these. Here is the link.
file:///C:/Users/arkna/OneDrive/Documents/Manuals/Machine%20Tools/Southbend%20Lathe/T-Slot%20cross%20slide/Machining%20A%20T-Slotted%20Cross%20Slide.htm

Al-