Re: cast iron drums ??
Maybe try calling Mr. Gross and/or a few Model A parts suppliers .... maybe they can assist ..... worth a try.
Maybe unknown to some, but, most manufactured bells when rung have a distinct musical note, like the musical key of A or whatever.
The Randy Gross drums may ring with a different musical note than that of the Plasma drums ...... also, drum notes will change when metal is removed after the drum is turned.
FWIW: If all (4) drums are turned, it is not necessary to get them tuned up. LOL
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