If you know a TIG welder he can spot weld the tip of the pin without hurting the heat treat of the blade. I have done this many times. If you heavily mask off the blade you can mig weld the pin and then grind off. Also a good peen into a slightly counter sunk hole is almost invisible, especially after bluing or polishing, it just can't leave any gaps. I can't recommend stick welding it unless you are really good at it.
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