can someone tell me what size box section will slide inside each other im sure someone with have answered already I've been scrolling the forum but can't seem to find it .
Interesting idea later on in that video with the HSS and weld-bead cutting edges.
look at the likes of "metals4u.co.uk" plus the one that's always mentiond on here begins with B but can never rememeber....
etc they all sell TELESCOPIC square box n tube...saves all the bother....loads'a sizes.....