Help to ID screw on collar - Airmark AM400 ceiling fan

[glenn0452]

Photo in link below shows arrow pointing to a lock screw for a threaded collar. I need to get the top of the switch housing off (unscrew it) so that I can replace the flywheel. Can anyone tell me what type of driver (and bit size) is needed to get this very tight one loose? I have looked at it with a magnifier and still can't tell if it's a hex head, a Torx screw, or other.

IMAGE LINK: Airmark AM400 switch housing lock screw

[Obi-Wan Canopy]

Nov 16, 2021 0:02:14 GMT -5 glenn0452 said:

Photo in link below shows arrow pointing to a lock screw for a threaded collar. I need to get the top of the switch housing off (unscrew it) so that I can replace the flywheel. Can anyone tell me what type of driver (and bit size) is needed to get this very tight one loose? I have looked at it with a magnifier and still can't tell if it's a hex head, a Torx screw, or other.

IMAGE LINK: Airmark AM400 switch housing lock screw

The picture does not work.