Sperm whale oil is indeed difficult to get out and defies easy combination with solvents. Dennis Smith ( The Stockmaker) had that problem with this C. A new finish will not adhere until the old oil is out, and it will take months with sperm whale oil.
Many refinishers, professional and amateur, use a dilute solution of isocyanide glue ( Superglue) to seal the inside of a stock head. If full strength, it will be too thick and may cause fit difficulties. I don't, instead using grease, not oil, on an action. Grease better stays put without running like oil.
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