I have bought plenty of unbranded cheap adj readers on eBay . From real small To 38 mm I had 3 arrive today in the 13 to 19 range ... upon inspection the blades are not straight sided. Normally regardless of weather they are set in the adjustment range the outer measurement eg 17 mm is consistent from one end to the other when useing calipers. And the Outer edge of each blade is straight .. but this time all three reamers have a dip near the top end. I will try to post a pic
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