I have a 4" zytel handled Ti Lite that is smooth as butter. I just got a 6" aluminum handled Ti Lite that I have opened and closed nearly one hundred times and the action to deploy is loosened up nicely either right or left handed, finger flick,thumb stud,pocket wave and inertia opening. My problem is it is a bear to close impossible to do one handed and tough at best two handed and I'm a big strong guy. My thumbs are tore up. Any ideas,tips,how to remedy this or anyone have this issue? Thanks. I like the knife but the thumb killer part is no good.