Nice work! I was hoping someone was 3d printing something.Original blade with the edge removed then JB weld tabs put on to help hold the injector blade. You can just slip an injector blade in and carefully adjust it from the back side with something thin. This means you can fine tune the aggression level. Someone said to do this they just put a drop of water between the blades and it held them good enough to insert then adjusted accordingly.
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Here is one of the blades with the JB weld tabs. Unfortunately this was a cheeper vintage blade and one of the tabs/ears broke. I have found the older ones with the greyhound or lettering etched in them to be much more sturdy than the blank ones.