For every #1 I've owned over the years what you must be referring to is an under barrel hanger solidly attached to the action.
There is NO spring involved there is only the solid, non-moving under barrel hanger to which the fore end is attached with one screw.
As said earlier, there is only one spring under the fore end, and that is the small and short sprint that activates the case extractor/ejector. It has zero involvement with any fore end attachment.
However, there are three solid points, all attached solidly to the action to which the fore end can be bedded. Once this is properly done, the fore end can be fully free floated with the only points of contact being to those three solid action points. There would be zero barrel to fore end contact.
If needed, I can take photographs which would show the solid action points and their bedding in the fore end.
Crusty Deary Ol'Coot