It is indeed a common problem, and if the plastic mount where the spring attaches broke off, I found the only way to "fix" it (without the expense of purchasing an entire assembly) was to jury-rig braided stainless-steel picture wire from the spring hook around the mount and back and then tighten it by winding the wire with a pair of needle-nose pliers until it was virtually wobble-free. I made that repair 5 years ago on mine and it hasn't failed yet!