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I've had quite a few Heljestrands passing by and can't recall seeing the "dent" you metion on those, but I do have had a couple where the blade have been so loose it have fallen out of the frame :)...

It's correct that the blades are removable, but I don't belive they were ment to be removed, only as a possibility to replace a worn out blade if anything.

The blades are held in place by because...

I've seen several ivory scaled Swedes with collars, might be a Swedish "thing"