Yes it was all done on a manual hand-crank Bridgeport machine.
1/8" pillars with 1/8" channels in between. The base is definately (in my and many others' opinions) a bit thick, at .250" right now. I'd like to mill it down to around at least to .125" or thinner, though I might just wait till I make the second version to make this change.
and i probably (almost definately) didn't need that many bolts, but i didn't feel like having it leak and aluminum is easy enough to tap.
thanks for your comments (the creator of the ever-so-love spiral block
)
Have people sandblasted the inside of other blocks? does it help performance?