I just fitted the Hepco and Becker centre stand to my Ten and I got the large spring on by this method, (as I don't have a vise to hand):

Hook the spring onto the attachment point on the frame, then use a couple of heavy duty cable ties in 2 seperate closed loops of equal size, around 3cm diameter will do.

Fit the loops over the unattached end of the spring and use a screwdriver to pull on the loops, stretching the spring until it can be fitted to the centre stand attachment point.

Cut away the loops with cutters if they are trapped under the spring.

Using the loops between the screwdriver and the spring makes it easier as the screwdriver does not get in the way when you are trying to hook the end of the spring over. It also seems to give better control over the spring position as it does not slide up and down the screwdriver's shaft.

I would recommend heavy gloves and eye protection minimum though incase anything goes wrong!

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idler