T420 won't dock into docking station

Have a docking station Type 4337, but T420 won't snap into place.  Same type of docking station at work, has no problem with T420 snapping in.  Seems to be binding somewhere, but cannot get it to budge.  Key is in place and in unlocked position.  Not sure if this is defective or if I am unaware of something.  Seems simple enough to use.  It appears to be stuck in the 'undock' position.  Something under the 'spring loaded' docking pad, appears to be preventing it from moving down to the 'docking' position.  I think this thing is defective.

I compared the two docking stations and identified the problem. There are two plastic hooks built into the base, one to the right of the connector, one to the left and below. In a correctly functioning station these hooks are pushed aside as the computer is inserted, then spring back, holding it in place.
On my malfunctioning station the hooks were stuck, preventing the computer from being inserted.
I was able to correct the problem by nudging the hooks with my finger, which unstuck them. If they stick again I can try some graphite lubricant.

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