Bartman,
Some of the older Microtech products used a special type of screw/driver called "Spline drive", which is a lot like torx, only the corners of each point are squared, instead of forming a "v" like with torx. Spline drivers come in bits and in "L" keys like hex keys, but they are very hard to get. The name of the company where I get my spline L-keys is McMaster Carr, here's some contact info:
Atlanta 404-346-7000
Chicago 630-833-0300
Cleveland 330-995-5500
LA 562-692-5911
NYC/Pliladelphia 732-329-3200
and the web:
www.mcmaster.com
Generally, the MT spline screws are the 6-flute variety (there's a 4-flute type also), and a diameter of .048, .060, or .072. On some of the newer MT stuff, they use regular torx screws and you can get those drivers at Sears, like stated above. I have an older Socom that had all spline screws in it, and my new M-UDT has both spline and torx! The M-UDT has spline handle screws, torx pivot screw, and torx clip screws. Sooner or later, you run into knife companies that use spline screws, that's why I bought the drivers (I hate not being able to take things apart!). Yes, like stated above, the clip screws are a very small torx size that Sears doesn't carry, like a T5 or T4. My local Sears only had a T6 as the smallest.