I did not do any grinding, I did not replace any parts, I did not remove lock tumblers from the lock housing, I put heavy vibration on lock housing near clamp with 10mm bolt at same time I moved the steering wheel and key while vibrating the lock housing, the key turned for me, without vibration that key would not turn for me, I considered all drilling methods..., // the heavy vibration from my air chisel was the trick that worked for me, my steering column still locks without that tiny pin and spring. electronwizard