Actually the difference between the 1ST pic and the 2ND pic is all done by hand no machine work here. I first used a 4 1/2" electric grinder with a 60 grit flap disc to remove the remainer of the ribs then used paint stripper to remove the remainer of the baked on Black paint and then used a dual action sander starting with a 80 grit working up to 220 to achieve the finish you see in the second pic.