Yes, the Triple X is good for medium heavy oil, and a tad more if you sand it. I have mine polished to 1000 for medium-ish. I have not had any trouble with their balls dying so far either.
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16 years and still going strong! 16 years old that is!
The names Warrior Princess, Xena..Warrior Princess
And why would I "saw" pins in half, THATS A WASTE OF PINS!