Here is a round-up to my excersise with the lock, may be useful as a temp fix for the original problem with V70 (key doesn't go past pos. I). As mom explained in his description - see link above,- there is a cast alloy bit on sliders in the lock between the cylinder and the switch. It pulls the stee...

If you can turn the key to position I, you need to free the broken tab from the lock plate. You may hit it a few times, but the best is to remove it, clear the debris and put it back (step 3). If you want a definite fix, you need to remove the extra lock pin. OK, now, here's how I repaired the stuck...