One of our new people asked "What exactly is the best way to remove the thumb safety on a 1911?"
This is what works for me to remove:
Unload, check, and check again that the firearm is unloaded.
Put any and all ammo away from the area you are working in.
Remove the slide assembly.
Cock the hammer.
The safety has two "positions". Off safe, safety engaged.
The safety has to hit the "sweet spot" to be removed correctly. That is found by moving the safety in small amounts from the maximum travel "up" and going off safe.
Although the video is mainly talking about a grip safety, it demonstrates also how to remove and install the thumb safety.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)