Slow day in the vintage Mooney world so here's another esoteric topic - moving cowl flaps - specifically they disappeared one plane before mine -SN 680002 - rolled off the line. I don't know if they ever came back on the C or if any other planes lack them. Can anyone enlighten us? Also, has anyone ever made their fixed cowl flaps movable? Was it worthwhile from a CHT perspective? If so I imagine it's a cheaper project than the top overhaul it might prevent.