Hi,
I Had the same problem when I got my 0630. Could barely get it open with 2 hands. After 3 days of trying to force it open my thumb had a blood blister and I was seriously regretting my purchase. BUT STAY STRONG - it will break in. Probably took 2 weeks and now it is just butter. Certainly any index finger contact with the lock bar acts against you. I have found a slight wrist flick with minimal thumb pressure on the disc gets the blade out with a snap! I have also started flipping it open using thumb on one side and index finger on the other side of the disc and man that blade pops out. Now that its broken in I can't put it down. I have not carried my Sebenza, Spyderco Military, Paramilitary or Manix since the 0630 found its sweet spot. Just give it time.
I Had the same problem when I got my 0630. Could barely get it open with 2 hands. After 3 days of trying to force it open my thumb had a blood blister and I was seriously regretting my purchase. BUT STAY STRONG - it will break in. Probably took 2 weeks and now it is just butter. Certainly any index finger contact with the lock bar acts against you. I have found a slight wrist flick with minimal thumb pressure on the disc gets the blade out with a snap! I have also started flipping it open using thumb on one side and index finger on the other side of the disc and man that blade pops out. Now that its broken in I can't put it down. I have not carried my Sebenza, Spyderco Military, Paramilitary or Manix since the 0630 found its sweet spot. Just give it time.