The letters "DA" stand for "dual action" . If you have one of the good ones like National Detroit , it will have a locking ring that locks the pad for grinding. If you push the ring to unlock then it will have an orbital action for feathering out paint chips or edges. Yes it will look like circular scratches. If you want to remove paint/rust etc , lock it in and use 80 grit , if you want to feather out an edge or chip so you cant detect it then unlock into orbital and use 80 first and then 220 and it's ready to primer. If you just want to rough up for paint adhesion on old paint then orbital and 320 or 400 grit. Use moderate rpm for feathering out. Too much speed won't do it correctly.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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