your link said i needed permission to proceed so maybe someone else can see it or post another link -- rustic cakes are some of my favorites
Here's a new link. This one should be "shareable"
i would do that with the tip of a knife -- might have to test a few -- i also thought of using a wooden fork that would have a little bit wider prong -- and you don't clean it off as you hold it up to the cake and swirl around the turntable -- the icing builds up and it flakes off and leaves the little bits all around all around -- but that looks to be done one swirl around at at time -- not several like a fork would do --
i use a regular fork to do that on the edges of a book like if i was making a vintage book -- but those are much closer together so you just need something that's a bit wider --