Ignition cylinder issue

I bought a BWD ignition switch (CS13) along with a Locksmart ignition lock cylinder (LC41020) and it just will not slide into the switch no matter how I turn it.
Pictures attached. Any suggestions?
 

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i am not sure what you mean by indexing, unless it is what you explained in your next sentence. if that is, it still wont slide in. the old one actually slides in...
im going to see about lc14010 because that looks like it would work.