Lets see now, a leveling screw or just set it on the concrete will cause
stress? There is no possibility of the foot of the machine ending up with
all of its metal in firm contact with the concrete as this is a physical
impossibility! No way that the concrete will match the flat of the foot so
there will only be one little part of the foot touching the concrete anyway.
Since the machine is sitting on its 4 feet and the concrete isn't flat
enough to keep all 4 feet exactly on the concrete, an unleveled machine will
indeed be stressed in some way. Using leveling bolts and so forth will
provide an equal force on each of the feet so that the machine will be
sitting level and even. IN addition, if you attach the leveling mechanism
to the floor, the machine will tend to not dance about the shop when an
earthquake happens.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!