On 22 Sep 2014, dpb wrote in alt.home.repair:

Why? If you want to go thru the exercise to size and have a spare
on hand, that's about as far as I'd go.

I want to put safety cables within the springs. In order to do that, I
have to remove the springs, at which point I might as well put new
springs on. Seems to me that 25-plus years is a more than reasonable
lifespan for such things. Most things I've read say they should last
about 10 years or so. Also, my springs look a little stretched out to
me.