Since I'm at it, why stop now?
An Iron Kiss needs no special floor or foundation. a 4" concrete slab is just fine. I've even run them quite successfully at demo events on a wooden platform sunk 4" into dirt. The mass of the hammer itself keeps it still. It doesn't rely at all on the mass of any foundation like some other hammers do.
I'd also like to update a previous statement. An 100lb Iron Kiss will actually out-hit a 150lb Big Blue. I happened to have an email exchange with John today, and it's all about cylinders, valving, and anvil mass. I know that John has some custom valving in his hammers that does some pretty trick stuff, but I have no idea how it works. I just know it does
Next time I get to work with one of his hammers I'll have to shoot some video so folks can get an idea of what I'm talking about with the Iron Kiss. I'll see if I can do something that a lot of folks here can relate to, like working down some of Don's W2.
-d