I'm calling BS on that one.........
the first picture was of a air driven fileboard, one of the most useless items to waste money on.
Then I read ,,,start with a oribital sander with 100grit, then proceed to 60grit by hand, this is total BS.
You should never , I say never, go towards the coarser grit. If you have to revert back to coarse, you're doing something wrong.
You always work from coarse towards finer grit.
this is worthless:
http://www.hutchinsmfg.com/View-Product ... _id=424043
this is THE Mack Daddy:
http://ndsander.com/900-series/
If you got enough air compressor to run the air-file, then you got enough to run the 900DA; there is no comparison.