Smalley L2 springs can be used as replacements for original Gamecube controller control stick (left) stickbox springs. Their force profile is a bit different, in my testing it's less tapered off, which allows for increased consistency with quick tilt inputs at the cost of dashing and similar quick full extension inputs taking a bit more force. My measurements, displayed as force-extension graphs, can be found here: Twitter post, which shows in-game input values (Melee levels) on the x-axis and force on the y-axis.
In total, these L2 springs still feel very close to a brand new left stickbox spring, so if you like a stiff feeling with fast tight return, these are a good option.
Installing these into a stickbox is somewhat tricky, so buying these is recommended mainly if you already have experience with disassembling stickboxes.
These are made from carbon steel, so they should not get wet, otherwise rust is a possibility.
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Per Kadano's thorough advice after answering an email query, I bought this spring on recommendation and couldn't be more satisfied with the results. Really happy with this spring. It replaced a stock T3 spring that had uneven amounts of snapback in the up and down directions of the Y-axis (more snapback when flicking down than up). This spring totally resolved this issue, showing very even oscilloscope readings in both directions on both axes. I enjoy the slightly stiffer feel as well, but if that's not your preference I imagine the force profile will decrease slightly over time. I definitely notice improved consistency and speed of tilt inputs. 5 stars for Kadano's items and service as usual.