It's not unusual for me to get clocks in for repair that "have been elsewhere". A two weight vienna regulator clock was brought in needing a click spring. The previous clockmaker told the customer the clock could not be fixed as he could not get the necessary part.
The images show the spring is not much more than a brass washer. I simply cut out a washer the same O/D and I/D as the click spring and then sawed, filed and drilled to the same shape as the original. These are very basic skills.
It cannot be stressed enough that when repair people who tell you that your clock cannot be fixed seek a second opinion, find a better repair person. It's true, not every clock can be repaired but in 20 years or repairing clocks I can count on one hand the number of clocks I have been unable to get running.