I have found both 4.5 volt batteries, "A21" in the right size from USA and 3D-printed battery cover from Italy on ebay, but not today.
My $34 Apo-Ronar 360mm cost me more in additional ebay purchase than lens auction to make it run.
As the shutters are 60+ years, so both electronic and mechanical cleaning would do them well.
Edit: Added words for clarity.
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