There have been cases of screws [A] to the handle of the cart loosening.
Cause:
The torque on the mounting bolt of the handle on the bottom of the cart is too low, so when the cart is loaded with paper and it is pushed/pulled repeatedly, the mounting bolt may get loose. This is likely to occur if the torque on the mounting bolt of the handle is less than 18Nm.
Solution:
If the cart's handle starts to rattle, or if the paper holder fails to be effective because of loosening, re-tighten the mounting bolt on the bottom of the handle.
Also, if the locking screws on the side of the handle get loose, re-tighten them.