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found the simple light test for double hollow posted in 2011 see below. Thanks Utopian, my 7/8 CarboMag is most definitely double hollow ground, though so smoothly joined it is almost impossible to...

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You guys are strict - I bet no chewing gum in line too, right. First try uploading a pic, next to a regular Griffon 60 5/8 with a ruler.

When my latest acquisition came in the mail last night, a Griffon 60 carbo magnetic, the more i looked at the grind the more interested I got: I began to suspect it was double hollow ground, or...