Originally Posted by
dgage
Flex uses forced-rotation with smaller (8mm) throw to do correction. The Rupes and other free-spinning DAs use throw to do more correction, which is why 15 and 21 mm machines are popular for correcting large areas on SUVs, RVs, etc. But plenty of people use 8/9mm DAs for correction though it takes longer than forced rotation or longer throw machines. The key with free spinning is proper usage and to make sure you put a line on the backing plate so you can verify it continues to spin. You’ll also want to use it near full-speed on a free-spinning machine to make sure it has the most power available.
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