Greetings.

Half a dozen in my house, and other places I maintain with several more also of the not-vintage types.  Have replaced them, cleaned them, repaired capacitors, switches, wiring in them but never saw an obvious lubricating points above or below them nor seen owners manuals guidance to oil them.  Do they need some dismantling in order to lubricate or there is a clever access to the proper point; or simply is a chinese discard-and-buy-new as if few drops of oil and little effort is too much to ask ?

Sealed bearings.

Cleaning is sufficient.