440 Throttle Return Springs

I would like to switch from a single spring to dual throttle return springs (inside each other) for safety reasons. The single spring has always been attached on the notched bar as seen in the photo “current”. Can I attach the two springs in the “proposed” position where the throttle cable attaches? The other photos show the contracted and stretched lengths. Any suggestions on springs that will fit with the correct tension? I looked at many, hard to judge.

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