Wow, I'm kind of new here, this is the first I've heard of these springs failing.
I bought a 710 when they first came out, 1998 maybe?? That knife has not been babied, the black finish is badly worn on the blade, and the grips are pretty smooth from pocket wear, the spring(s) have never had a problem.
The month the 705 was introduced, I bought one (two actually, one for me and one for the woman that became my wife), my 705 has been in my pocket every day I haven't been on an airplane since the day I bought it, so about 13 ~ 14 years, no issues what so ever. In late 2001 airport security got a spyderco that I'd been using as a money clip (a couple of weeks after 9/11), I honestly forgot about it being in my pocket, really dumb since I'd stuffed the 705 into my checked bag at the ticket counter... it was either give up the spydi or miss our flight. Anyway I replaced the money clip with a mini griptilian the next day, its a very early one with the oval shaped thumb hole, that knife has also been in my other pocket everyday since I got it with the exception of air travel days, so its going on 12 years old, again no issues with the spring.
I wouldn't say my axis lock knives have been either abused or babied, they've been EDC working tools, subjected to both sweat and salt water, and except for sharpening as needed, and a fastidious rinsing with fresh water whenever they've been in salt water, I've done nothing but use them, no problems so far.
Erik