Quote Originally Posted by MikeT View Post
Maybe the holes were there for after they popped the wedge out of the mold and needed to do final grinding adjustments on the wedge. The tool that held the wedge would have steel pegs that would go into the holes, when they felt the pegs grind on the file, they would stop.. knowing they had the correct angle..
?
This seems pretty plausible...

Nah, they would have just used double-sided carpet tape, like I do!

What do you mean they didn't have double sided carpet tape in 1790?