I'd been dreading this job, but needs must. I was forced to face up to it because I needed to get the Square Four on the lift in order to look at the gearbox before the riding season begins, and I didn't want to resort to holding the stand up with an aerolastic.
The way I did this was to take a piece of 2" rolled angle and drill a 6 mm hole at one end; I put a long M6 screw in the hole, and the small eye of the stand spring over the screw. Then I took a bit of 1/2" round bar and used it to stretch the spring by levering it against the end of the vice; I put a 5/16" washer in each of the gaps between the wire coils and when the spring was relaxed it was long enough to push into place by hand. All I had to do then was move the stand to stretch the spring again and all the washers fell out.
Repeat for the second spring and we are done.
Even my wife says it looks lovely.