I also use the nylon heads, I actually prefer the flat red disk ones http://www.harborfreight.com/4-80-grit- ... 60325.html which are my favourite item and they are under $5 I clean every piece of metal before it gets welded onto the car and then a light coat of oil to help prevent rust much better then anything else I tried A.
I bought the 12 speed drill press and it was junk D-,http://www.harborfreight.com/12-speed-bench-drill-press-60237-8909.html it made a few cuts then kept falling apart and destroying drill bits due to vibration. I took it back and got my money back though
Floor jacks
I have the 2 ton low profile and love it for home use, especially as my Rx8 in only about 4" off the ground I will give it a B+ (not an A as my tire guy has a broken one in his shop. http://www.harborfreight.com/2-ton-low- ... -8048.html
I have just bought this and not used it yet however virtually everyone who I race with uses this exact jack and it work great and is really light. If you have to change tires at the track this is the jack to use A
http://www.harborfreight.com/rapid-pump ... -7814.html