If you can get a thin pick down into the hole you may be able to use it to jimmy the spring out of the slot. If there is room, you can also make a circlet of thin aluminum (from a beer can) and slide it down the shaft to hold the spring back. This is from the thread on here about reversing front headrests, as they will also lock up this same way.
A picture looking down the open shaft of the housing may show how to 'pick' it.
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