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The loose part is the mechanical portion of the ignition steering column lock. The electrical part (at least on Nissan's) was a separate switch mounted to the back of the steering column lock.
The weak spark may also be related to the ignition switch, so that points to the switch as the most likely suspect. In some cases when the mechanical lock gets sloppy (as you described) it MAY cause the connections in the electrical portion to not line up properly.
Most ignition circuits use battery voltage for starting then use some resistance to keep the voltage lower when the engine is running. Is the spark stronger when (and if) it is running assuming you can get it running.
When you have two separate things that are not working properly, then the most likely cause is the source of voltage to those two separate things. One would be the ignition switch, the other would be battery and or grounds. That not an absolute statement but a most probable cause. It's why these things can be so damn frustrating.
regards
Mech
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