The unground base portion of my Rucksack knife is about 0.085" thick according to my vernier calipers.
I've had my Rucksack for a while and I like it, even if I only use it occasionally (it sort of has 'Sunday Best' or 'City Carry' status). The lock seems fine, although I never really trust any folder lock and I try to use my folders without depending on the lock. Actually, as I think about it, I can't really think of anything I do much of with a folder that makes a lock essential....I may as well just have an old slip-joint knife. If I am trying to push a hole through something with my folder, I try to remember to keep my fingers away from where the blade would go if it suddenly snapped shut.
I do occasionally lubricate my folding knives, especially the carbon steel ones. I use cooking oil....generally either olive oil or canola oil. I also use canola to prevent rust on fixed blades, other tools, and the steel cooktop on my camp stove. It works well, although it may go a little sticky if left in a thick layer for a long time. I store tools at a camp near the sea coast, and the canola has proven itself to be a good rust preventitive.
I once read a recipe for making your own penetrating oil, and it was a mixture of 'parrafin and rape seed oil'. Where I come from paraffin oil is also known as kerosene, and canola is a variety of rape. (about 9 parts by volume paraffin oil, to one part of rape seed oil). Naturally I would not use the kerosene mix on a knife I carried in my pocked or used for food preparation.
I am a fitter by trade, so it seems wrong not to lubricate any moving parts. However a lot of people don't bother and their knives seem to last well enough.
