The rigidity is also weak and the strength is insufficient, and the force which enters the direction which it is squeezed by hand is about to enter. For example, I think that it is necessary to devise such a way as to use the principle of lever by attaching an angle.
When grabbing the plug cap and trying to rotate it clockwise, there is no sense of rigidity, so the puller itself is twisted. If you put power into thinking firmly, the puller itself will deflect. The price is cheap, but I want a little more stiffness.