Do NOT reassemble without getting the proper TORX bits. You will likely strip a screw head with your homemade allen wrench. The Husky tool with mutiple bits from Homedepot or Lowes is a good one. The pivot screw is not a big concern because it doesn't really get "tight". Go easy with the little screws also, you can always check them after a week or so. Because of variations in screws and tools some people use a T-8 OR a T-9 on the pivot screws. All of the reset on that knife will be T-6.
Don't leave earth without some teeth. I carry a knife to open a can of worms.