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I'm not knowledgeable enough on Operas, Amberola 1B's, or Amberola III's to know that answer. Maybe someone like Uncle Vanya would know?

I have never seen a rubber coating / tip - on the shut-off bar. I assumed the tapered-end was present to help align to the end of the cylinder. Are others tapered at the end?

There were, originally, oil-plug pins / stoppers to cover the oil ports. Someone, perhaps Jerry Madsen, reproduced these many years ago. Following is a photo of an original that I have been attempting to get reproduced, with little success.

As an addendum to my previous post, using the Search feature of the APS Archives, I found a 1993 ITG advertisement for reproduction oil plugs for Edison Operas, Amberola 1A's, etc.

marcapra wrote:Look at the end of your shut off bar on the left side. You will see how the bar gets skinnier at the end.

Not mine. It's consistent throughout. Mine is super early so maybe they changed the design later?

I no longer own a School phono but in looking through my saved photos it appears that the one I used to have also lacked any taper.