If the head of the stock is deeply soaked with oil, you will probably need to submerge the stock in acetone, perhaps for a few days, to draw it all out. Then apply the hair dryer or heat gun and use alcohol or acetone wetted swabs to remove the remainder from the surface. It takes time, patience and a lot of work, but if you don't get all the oil out of the wood, it will migrate upwards and cause dark spots to form under your new finish. Be sure to wear rubber gloves, a face mask, eye shield, and work in a well ventilated area at all times with no open flames present. Keep us posted on your progress.
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