I take an oily rag. Covered all issues thus far. Spare sear springs? Going to replace them in the field? Rather amazing you can find ready made ones for that gun, much less change them out in the bush. Most shotgun springs, particularly leaf springs, require some custom fitting even on a mass production gun. I have shot with folks for a lot of years but have yet to meet someone who carries a replacement set. I do know three or four shooters with Westley Richards drop locks, but those guns have complete, pre-fitted, replacement locks.