In addition to my knife, I appreciate having a small pair of pliers, scissors, and a saw. I seem to find uses for these, and I've always carried a mini multi-tool for that purpose. For about two years I've carried a Leatherman Squirt PS4 that I modified by replacing the screwdriver/bottle opener parts with a small saw blade. When I recently lost it, I looked into just replacing it and doing the same modification, but the current model PS4 no longer has hex (or torx) bolts that permit easy disassembly for modifications. Now it just has smooth-headed tamper-proof rivets.
So I did some reading and ran across the Style P4. It is a pared-down version of the Squirt PS4 with an elongated handle and carabiner clip on one side. The Style P4 is about 0.5 oz lighter than the Squirt PS4. It only has pliers, scissors, and a nail file, but, unlike the Squirt PS4, the Style P4 has removeable screws (with size T6 torx heads). So, I picked one up at REI and replaced the nail file with a small saw blade that I fabricated by cutting a sliver out of a Gerber folding saw. I shaped the head (pivot) end of the saw to match the end of the nail file component that I removed, so the saw neatly springs open and closed like any of the factory-included components. The modification interferes with using the carabiner clip, but I wouldn't have used that feature anyway. I'll probably attach a lanyard. The modified tool weighs 45 grams (1.6 oz).
Before and after:
