This was purported to have been tried by soldiers -- sort of a do-it-yourself Trac II razor.
My initial thoughts were as follows:
- Similar to shimming a razor, it will change the geometry of the razor head making it a more aggressive shave.
- The two stacked blade edges are likely too close together to create beneficial hysteresis, and may in fact inhibit the effectiveness of the blades.
- The razor geometry was made more aggressive due to the lower blade having a more positive blade exposure.
- The blade edges were so close together that it was difficult to even distinguish them; they appeared as one blade.