Looking at that attachment it looks easy. I am actually sitting here and thinking that looks like a direct copy. Bit weird there is not much about it on youtube . If its simple many seem to write about it. LolA 1:1 pantograph is easy.
I had a plastic one when I was a kid - pointer on one end and crayon/pencil in t'other.
But again here is Joe's latest reply.
I still don't follow him or is it me being thick? (Again)