Shotgun Technicana , Michael MacIntosh & David Trevallion, a collection of articles from Shooting Sportsman Magazine, has material on the amazing "butt transplant". Of course, Bubba may have it also. There have been many threads about removing lube oil from stock heads with whiting or by immersion in acetone; I don't think they're archived here but someone will provide you with a copy. From what you say, you appear intent on avoiding DIY rather than stepping in it so this material may not be of use in vetting possible buys.
jack
