Trev, I have an orphan original M70 steel buttplate that I'd trade for your smooth one, if you're interested. I have no interest in restoring any M70s but acquired the buttplate as a target of opportunity in a trade. If it'll help you, I'd trade for the price of the mailing, as a way of paying forward some of the help I've received here & other places in the past. Treeblood1 aht ayowell daht cahm.
BTW the price you passed up on the Mannlicher trapdoor BP & GC was about $100 (or more) less than it was worth. Too bad....
Regards, Joe