Handles for busted-off hacksaw blades: wrap in duct tape, the survivalist's friend. :~} Keeps the saw from bitting you, and is easy besides.
The best "modern" tinder: real cotton balls, with candle wax melted on them. Easier than setting up a double boiler, which is the only safe way to melt wax over an open flame. Just light the candle, and let the wax drip on the cotton ball. Half of a cotton/wax ball will burn fiercely for about three minutes, is easy to light with a sparking rod, and you can fit five full-sized balls in a 35mm film can, giving you the potential for 10 fires.
The best "traditional" tinder: char cloth. Just cut old tee-shirts (100% cotton, again) into 2 inch squares, and place the cotton in a pellet tin. Poke a hole in the top of the pellet tin, and put the whole thing IN your fire. When smoke stops coming out of the hole, your char cloth is done. It will be totally black, extremely delicate, and will catch a spark quite readily. Make a "nest" of shredded up grasses or bark, put the char cloth on top, strike a spark, and fold the tinder ball around the char cloth. Blow into open flame. A pellet tin will hold at least 60-75 pieces of char cloth, and natural tinder is all around. And, of course, Bic lighters are cheap and functional. Just not as much fun. :~}