Great to read all of the comments - Thanks.
A loop or a bow in the spinner wire is another option - any movement will show up. but please wire in the correct direction. (link below for those who missed it the last time).
Safety Wiring Procedure for Spinners : Vintage Wheels, Hot Rod and Muscle car
IMO building and maintaining a Cobra or any hand built car should be compared more to owning a race car rather than a modern production car -from a safety standpoint.
Use safety wire / thread locker on safety critical fasterners such as chassis / brakes / hubs / steering ,ensure all hardware is of the correct grade with sufficient thread engagement .Many cars are running huge horsepower with solid motor mounts,vibration will shake things loose!
It will not cost you any more ,just a bit of extra time .
After 30 odd years of Rally and Race car driving I've seen just about anything shake loose -somtimes causing retirement or worse on the last special stage of a 3 day rally!
The above is obvious to most - but not all !!
Bob and all at Vintage
vintagewheelsus.com