They are open on the back side so you can service them.
They need to be cleaned and repacked every so often
Of course , no want wants to do that kind of stuff any more and many probably don't even know that it should be done periodically.
section 2-12 in the service manual
Common service item on cars as well "back in the day"
One of the 1st service procedures I and many others my age learned as a kid back then
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