Ok, just one more question. I got past the solid thing. Got past SU crashing every time I did a solid subtract. Then finally, I got every thing right, 2 water tight groups etc. But the result is not what I expected. In playing around with subtract using crude shapes I felt I understood the end result but this subtract transformation on my groups is completely different. I tried reversing the "1" and "2" but there results are still perplexing. Any insight? Group 1 is a representation of four bolt holes complete with ledges for the heads of the bolts. Group 2 is just a shaped hunk of metal. The result should be holes in the hunk of metal correct?
Thanks again!