Worn jack blades
When I made my jacks I used mild steel for the blades. I wasnít sure there was any point in using carbon steel and hardening them as they were going to get hot in service which could re soften them.
Now I have a little experience I can see that they need to be ware resistant. Is it worth using manganese steel (if I can find it) or is mid/high carbon best. From the colour of my used pair Iíd guess it is worth hardening them as they donít appear to get hot enough to draw there temper and loose there hardness.
I know I shouldnít be grinding them on cold neck lines, Iím getting better at that.