Hi
I'm hoping that there is someone in engineering that can help. It's a little off-topic, but I need a left-hand threaded bolt 7mm dia and 20mm in length. I couldn't see anything on the web and ended up having to order from China. I received my long-awaited bolt today and it's, unfortunately, the wrong size. Think I ordered an M6 20mm bolt. It's a Screwfix
shredder blade holder. Beware with their equipment : this is the second time I've been unable to get spares, last time it was a lawnmower part..