Picked up the stamping die for the corner glass retainers this afternoon. You can see the test parts pressed from (rusty) scrap 1mm steel sheet. This die is a very complex arrangement with springs and rubber bumps and about 15 seperate pieces. It stamps the shape and the four holes in one hit. I don't know what it weighs but I couldn't pick it up on my own without quite a struggle so I'm guessing about 25kg?

The same place will now make a folding die to bend the four flanges down then we will have a small hand operated press to give the brackets their final curve before sending them off to be powder coated or plated. There is a lot more to a simple corner bracket than most realise (me included).