the powertrix arm that cracked. He was talking about the difference between the SPL arm and the original Midori design. I believe he said Escort racing designed the offset version, which my understanding was the design that A) resolved the adjusting collar problem and B) was the design SPL used. The MotoIQ article about the KW coilovers showed a picture of an original Midori arm with the collar interference problem and a side by side comparison with a new powertrix arm. My SPL arms were offset like the powertrix design.