Good morning: the Gi can openers in the larger sizes,make good makeshift screwdrivers also.
As for opening cans with a rock sheesh, once on the trail to the Barranca de Cobre I was effectively abandoned by my man, the local mail man, he had agreed to carry some of my stuff while I stayed behind looking for a mule. The end result was that I couldn't find a mule in time, and since my bed roll etc was with the mailman, I decided to go after him on foot, mistake, that little wiry character could travel, he did it every day.
Before I left the ranch, I went to the little store and bought an oval can of sardines, just in case I didn't catch up to him, second mistake. Well I didn't , and as night fell, made a small camp alongside of the arroyo. I left the can of sardines for breakfast, and built three small fires to keep warm, one at my feet, the other two on each side of my shoulders. One uses very little firewood this way and can keep quite warm.
The next morning I took off after him and found that he had camped just 600 meters further up the Arroyo - sigh. About 10:00 I decided it was time to open the can of sardines, no knife, it was with my gear. So I was reduced to looking for a suitable rock. The operation took about 1/2 hr, but I had my breakfast, and smelled like sardines for a week. How to remove sardines from a can with no spoon or fork? fingers naturally. eating them was the third mistake - the sardines, not my fingers..
About 11:00 it was forcibly brought home home that the sardines were tainted urp. I had a two quart canteen with me, habit, so I forced myself to drink as much water as I could, hoping to dilute the problem. Every 100 meters there was an urp session and another liter of water drunk.
This went on for two days until I finally wobbled into my destination, Chinapas. I found a cot and room and for the next three days stayed in bed, just urping. Where was my TT Luv to hold my poor hand, and coo sympathizing words to me?
Soo, I learned several things, (a) always keep a can opener of some type with you, (b) the possibility exists that the rock from the arroyo was contaminated , or (c) the d---- sardines were spoiled. I still can't eat that brand of sardines.
Moral, always have a gi can opener with you, AND, be sure of your food, this is especially important in a survival crisis, I was lucky, I learned later that many had died from this.
Don Jose de La Mancha (the former worlds champion in urping, and feeling sorry for himself)
p.s. Ray, the basic problem in roasted "Long Mary kai kai" is where do you get an oven that size in the jungle?
surely you wouldn't suggest dismembering first? Think of the aesthetics .