I'm trying to remove the thumb turn on my door. There appears to be a set screw that's preventing the knob from coming off. I believe the manufacturer of the lock is Lawrence Hardware.
I have tried every hex wrench I have (including those in my iFixit kit: https://canada.ifixit.com/products/mako-driver-kit-64-precision-bits). Everything just seems to freely spin.
Does anyone know what type of screw head I'm dealing with here? Is it a security bit of some sort?
Thank you in advance for the help!