We just received news from Oleg about a manufacturing problem on the SPR01 springs. A batch of springs where made with the incorrect material. The SPR01 spring should cut from a 0.8mm thick material. Instead a recent batch was cut with the 0.7mm thick material -- the same stuff used to make the SPR01S spring.
We'll be digging through the Awesomatix USA inventory to prevent this problem from being spread further into the environment. If any North America customer has the SPR01 springs that they suspect to be wrong please contact us.