I am building a very small tree platform (about 2m x 2.5m) and need some coach screws for the trees. The trees are young birch trees, around maybe 20cm in diameter, and there are three of them. I guess the weight that the screws need to take is in the region of 500kg.
My first question is about the size of screw I should use. I have seen mention here of 3/4" coach screw. Would this size of coach screw be suitable for this size of tree and the weight of my project?
My second question is about suppliers! There is a very useful post in this forum about specialist treehouse suppliers, however they are all based in the US and I am building my project in the UK. I was looking at SwiftFix as a possible supplier for my coach screws.