I strive for originality but violate it for safety sake. I've probably used a second spring for 30 years or more. It is not within the original spring but pulls the lever forward from another location.

I had a cruise control stick at 70 mph on a vehicle once. Fortunately I was able to stay at the speed until I got to an exit off the Interstate and shut the key off and coasted to a stop for a side-of the road disconnect of the cruise linkage.