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If gravel boards are anything like the posts they hang out with I think stitch drilling wont harm them.
My method would be to neatly stitch drill a round shape (so there aren't any right angles/corners to crack) using a fairly small bit - maybe 5mm. Then after go round with an >8mm bit which should hopefully join most of the holes to an effective cut. Then find something like a block of wood about the size of the hole, line it up with the bit being removed and give it one swift proper whack.
It'll be quite a lot of effort, so I'd question if the hedgehogs are really worth it. Do you know for sure it's an access route?
hugo7
jellybaby
I want to make a hedgehog hole in a gravel board.
It needs to be approximately 13cm in diameter.
I have an SDS drill, but no angle grinder.
What's the cheapest way to do this? It doesn't need to be neat because a hedge will hide it, but I don't want to smash the gravel board to pieces.
Is there a way that doesn't involve buying a 110mm hole saw attachment?