Support BladeForums! Paid memberships don't see ads! It does not need to be painfull to use an Umnumzaan. Load your thumb nail forward on the stud and flick it up. It will open everytime, without raw thumb pain. If it will not open up all the way yet, it needs to be broken in or it's dirty and needs a cleaning with fresh grease. It's my favorite knife too. I'm hoping I can find another one on the exchange too.