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I'm working on a cal 30.10 at the moment which also has the original mainspring with separate slipping bridle. However, the conventional mainspring which sits inside looks fairly "set".
The replacement at Cousins is a conventional automatic mainspring, ie. one piece including bridle. I'm not sure if I'd be best leaving the original, or going for the replacement option which is not as per original, bit at least not set, and probably unbreakable.