Question about earth wire - photo attached

[davesparks]

Constant force spring

 

[PEG]

Yes basically, CV joint is actually constant (angular) velocity which is a special kind of universal joint that is basically smooth regardless of the angle or turn, used in car driveshafts

...And as a little extra,the balls out of a CV joint,make devastating ammo,for a high-powered catapult

 

[stevels4]

It looks bulky enough for a spring clamp under the tape although I tend to use self amalgamating tape over the spring.