These cable kits are very well proven. The end fittings are load tested in every batch. This is not always understood, but the only load a correctly set throttle cable should ever see is that from the carburetor or throttle body return spring, or the kickdown spring in the case of the auto T25 / T3 / Vanagon. The only way they can ever see a higher load than that is when incorrectly set (too short), so the carb or throttle body runs out of travel before the pedal reaches the floor or its down stop. When that happens, the cable sees as much force as the driver puts on the pedal at full throttle, and this is when things get overloaded. Therefore setting the cable as per the instructions is important.