I used a couple of tooth picks on my TMIC.
The fins are extremely delicate - they will bend and also stretch (and break).
Even an accidental brush with a cleaning cloth did some (repairable) damage...
I used one toothpick tip horizontally to provide a profile and used another to flat the fin onto the profile.
Have to do one end of each fin at a time. The fold profile is slightly different at each end so trim (blunt) a toothpick to suit.
Takes ages but restores airflow fully
