I have unusual spring-open dampers that use a length of notched plastic ribbon that winds around a spool where the damper motor (a Synchron) connects (see pic). Each damper blade has its own return spring (behind the orange plastic). The end of the plastic ribbon broke and the damper is now stuck in the open position.
The contractor that installed the system in 2008 is no longer in business. Another contractor that came to take a look said he'd never seen anything like this and proposed to replace the entire damper. This seems like overkill as everything but the small plastic ribbon is working fine so I'm hoping someone here can recognize the design or manufacturer so I pass this info to the contractor.
Also, should I be looking for another contractor? He didn't want to spend any time trying to figure out how/where to find a replacement part.