The blade holes wear out and they are hardened ,I don't think the blade plate is hardened to any were near what the blades are.
I know the bigger machinery definitely has hardened blade discs .I don't think blade plates are just mild steel.Blade discs seem stronger than mild steel to me.
The 21 inch Rover has 2 different sized blade plates ,one is only about 1/8 smaller than the Victa plate and with the 4 blades on the Rover it would be around the same weight as the Victa with 2 blades. Yes still a bit of work to do to make the Rover disc fit.
I think the postage price of $50. for 20 kg is reasonable.for parts and a lot easier than making up the parts. If the old blades and bolts are removed the postage may only be $30.
