center stand spring, 1969 Commando

Can anyone tell me where the center stand spring attaches on the early Commandos? The bike is all stock with the old style center stand. As I understand, the spring simply goes under the bottom tube of the stand, but I don't see where to attach it to the frame. There is a small hole close to the stand pivot point, but it is too close to cause the spring to extend when the stand is down, if that makes any sense.
Thanks,
Rick

Thank you! I guess my searching was pretty poor too!
Rick