I had only a very small chamfer on the dog holes in my Roubo bench, today when using a hold fast, I had a blow out!
The hold fast was in the second hole from the right, so the back of the hold fast was against the left side of the hole.
Some epoxy and another holdfast....
Good as new!
now all the dog holes in my bench have a more substantial chamfer on them.
I guess maybe my dog holes are too close together, about 4" IIRC, but it is nice to have that adjustability in the bench.