1. clamping the spade
2. removing the rivet
3. separating blade from shaft
Separate the shaft and the blade by powerful hammer blows on the shoulder of the blade. If the rest of the shaft is too short to be clamped, tighten the head of the spade next to the shoulder into the vise. Now put the chisel into the gap between the spring halves and remove the rest of the shaft with hammer and chisel.