Hi, here is one idea I am about to try.
My neighbor runs the council tip in our area and there is always good stuff appearing there. There was a broken set of garden branch secateurs (those with ca. 400-500mm arms) the plastic shank had cracked but they had obviously done a lot of work before this happened. The blade was held in by 2x 3mm bolts and it had a curved blade what surprised me was the blade was not chipped or dented and was still very sharp. The steel used must be very good so I will have a go at adding a pair of scales to it and see if it make a good knife (the blade is curved with a black finish and is about 2.3 – 3 inches long with a 4 inch tang area). Recycling gone mad I know, but I want to test the steel. Martin