Any of you K 31 shooters have a good lube for the bolt ? I know they originally used some kind of grease. I have tried all kinds of liquid lubes and don't get good results. Maybe I need to disassemble the bolt and clean the rotating part of the bolthead. just seems to be difficult to operate the bolt. Don't get me wrong it still functions great and reliably, but seems to drag more and more after a deep cleaning;(except for dismantling the bolt). Did I just answer my own question? Oily {One of the fortunate ones who bought a K31 20 years ago}