ayryq - Welcome to the forums! In answer to your question, yes the CUDA sliding button opening system really does work. The blade rides on a phosphor bronze bushing which promotes smooth action. The button itself is of 17-4PH steel and is able to pivot along with your thumb as it goes through the opening cycle. The big button is easier to seek out that a smaller thumbstud - I found out the best way to carry a CUDA folder is clipped to the right hand pocket. When you extract the knife, your thumb automatically rests on the disc. Using the disc as a pivot point, the handle swings down to where you can grab it securely and push up on the button to open the blade. all the while, your thumb does not leave the disc. Also, the big textured opening disk makes it easy to open with work gloves on. Hope this info helps!
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Dexter Ewing
AKTI Member # A000005
Living life "on the edge"