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Tuossa oli ihan teko-ohjeetkin.:thumbup:
A friend of a friend gave me a piece of 3/4 inch ( 19.02 mm ) square bar stock. I scribed the 10 mm x 18 mm x 25 mm tall trapazoid on one face of the bar. I cut two pieces of aluminium angle and placed them over the jaws of my vise. I clamped the square stock such that one of the long lines was even with the top edge of the aluminium. With an angle grinder I ground away all the metal above the aluminium . ( The grinder "grabs" when it hits the aluminium thus making it easy to know when to stop grinding.) Turned the bar over and repeated. Remove the bar from the vise and scribed another 10 x 18 x 25 trapazoid on one of the freshly ground sides. Again clamped the long line even with the top edge of the aluminium. Grind once more - turn over again - and grind the fourth side. Made the whole thing a little prettier with a belt sander.