Based on other reviews I didn't bother to try the included HSS blanks (waste time grinding them?). Instead, I was inspired by another reviewer's approach to using carbide turning tools. I had several similar inexpensive bits so I rotated the shank to fit the largest of the three holders. I wanted to see if I could do a decent single pass surface on a 2x4 block with a good knot. Not too much of a challenge for this holder and it worked well for such a long extension (3.5" circle). The surface was fairly smooth on both the soft and hard parts of the scrap, suggesting the holder is quite stiff. Tried it on aluminum with the same good results. Other reviewers had issues with the set screws, but mine handled very high torque with no problems (do they use a 3/32 wrench instead of 2.5mm?). Since I'll be using them primarily on desert ironwood and aluminum, they should work. Yes, as you can see from the photos, the carbide face is on the wrong side of the tool; I had to run the windmill backwards (counterclockwise).
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