Machine is anchored to base with four 3/8''x1-1/2'' bolts - threaded into 3/8" nuts welded on the Base corner mounting plate. The counter-bored hole in the wood spacer block (4-1/4''x 5-1/2'' x 3/4'') provides clearance for the nut.
FYI - I just posted (2) 20" Crescent band saws on Craigslist.
There's a detailed description in the ad, but if anyone here has questions let me know or send a PM.
http://raleigh.craigslist.org/tls/3683434569.html
Pic of the 2 saws pasted below