It's certainly no new thing but it surprises me how little it's thought of when diy fabricators talk about tube notching. I don't own a tube notcher yet I work with it a lot at home carrying out all my notching on my saw. For sensible money it doesn't get any easier IMO. I can't stand the hole saw type particularly if you have a lot to do and it's reasonably thick wall. Any how I thought I'd ask what you guys do Pics from the other day messing about which made me think about asking the question. Takes less than 15 mins start to finish. Set angles on saw (I use this tube a lot so I have my angle marked for notching it. 3 quick cuts. (I like a flat on the front I find it welds better on the meeting point.) Tack it and whip round.