Official Answer
Answer
Using a sharp-edged tool like a chisel or a hardened screwdriver to remove a spiral ring can create a 'nick' or 'gouge' in the groove wall or on the ring itself. If the ring is reused (which is generally discouraged), this nick acts as a massive stress riser $(K_t)$. Under cyclic axial loading, a fatigue crack will rapidly grow from this site. Furthermore, damage to the groove wall can prevent the next ring from seating properly, leading to the 'pop-out' failure described in ID 651. Proper training for field service personnel should emphasize the use of the removal notch and a rounded-edge 'pick' tool to preserve the integrity of the precision-machined groove.
