Since these things are pretty hard to tell apart, I'm currently keeping notes as to what springs I have installed, but I think I already messed up there, forgetting to update my notes after one change, even though I was sure what I had on there. But the spring I just had to take off my X-axis definitely didn't feel like the 30A I had noted down - it was probably more like a 40A.
In any case: It would be nice to either have:
1. All springs color coded/coated from the factory. Like white for 10A, green for 20, yellow for 30, red for 40 and black for 50 ... or something like that.
Like here:

or
2. The included black rubber sleeves color- and/or number-coded so that users can do their own "labeling" of their springs. Just put a "10" on some of them, a "20" on some, etc. Or simply include some in five different colors.
Of course, I would prefer the more idiot-proof solution 1.

S.