There are two spring loaded Aluminium Oxide grinding wheels (coarse and fine), which apply a controlled pressure to the blade of the knife. Please note that this machine is a sealed unit and there are no replacement parts, however, under normal profile use, the sharpening wheels are guaranteed for life.
The grooves in each section hold the knife at a 15º angle giving you a perfect cutting edge, which is impossible when using a steel.
The left groove in each section sharpens the right hand side of the knife and the right groove, the left side. The knives are sharpened in the coarse section (marked 1) and polished to a razor finish in the fine section (marked 2).
Why change something if it works? Because, at Spyderco, we practice the principle of C.Q.I. - Constant Quality Improvement. If we can refine and improve the ergonomics or cutting performance of an established model, we do it.
Our 2010 Para Military 2 has several changes over the classic version. The G-10 handle is narrowed at the end improving the ergonomics. The handle and blade have been profile thinner; removing uncomfortable angles when in the closed position. It features a Compression Lock and an ambidextrous-friendly four way clip which carries tip-up/tip-down, left/right-hand and rests deeper in a pocket. We kept the same high-performance CPM S30V full flat-ground blade but we've also lengthened the blade's tip and added additional surface jimping to both the spine and finger choil. Implementation of a new Bushing Pivot System generates fluid action and more consistent manufacturing tolerances. Larger lanyard gives more options for carry.
Refinements to overall construction may not be drastic or even visible to the eye but from the G-10 textured handle to the CPM S30V steel full flat blade, everything is sharper, smoother and guaranteed to provide performance and user comfort.