Here is a little "mod" I made to the Taper Pin holding the tail wheel spring into its steel receiver.
Just get a slightly longer "grip" length, machine the taper out of the end to allow sliding into a 5/16 - 18 (or 24) hex nut, then TIG weld together. Having the nut solidly attached to the pin, allows for greater and easier torque application during the removal process.
Since the pin is hidden inside the fuselage - no additional drag is incurred.
This looks like a great idea. For those of us without the ability to weld, what about machining a simple slot across the wide end, to accommodate a flat-blade screwdriver? Not as nice as your solution but still maybe better than vise grips.
I did not - thinking that where I was doing the welding was far enough away from the shear load so as not to materially effect the pin's performance, and the load undertaken (from a shear standpoint) is pretty minimal.