First of all wouldn't shift as if something was stuck. When I took it apart wrong screw was holding ignition switch tumbler, turn signal part was partially cracked and internals needed servicing. Was thinking of purchasing rebuilt column, that way I don't have to mess with it.What is wrong with your column?
Intermittentlywas it stuck in park?
If stuck in park, could be the ignition switch as it releases the lock pin and shift lever.