My home-made blades are mild steel angle iron, 3 x 30 x 30 mm, and work well but need frequent sharpening which is done after every tankful.
The hardest part of mounting them to the bar blade was drilling the holes.
The blade carrier on the mower shown now has 4 blades and apart from giving a beautiful cut it picks up every loose bit and sucks in nearby leaves and sticks, fills the catcher very rapidly.
The holes in the blades and the shafts of the mounting bolts are frequently inspected for wear. So far the cutting parts wear out before the holes elongate.
My fleet of rescued mowers are mostly used as paddock slashers, our property has only a small area of "lawn" so only a couple get used with catchers but the blades handle mulching rough stuff well.
Public liability and insurance concerns stop me from thinking of giving any blades to friends and others.
