My way to fix this problem (especially with the Leek) is to loosen the pivot and first handle screw after the pivot. Then press the blade past center in the opposite direction. Tighten the loosened handle screw then the pivot. Finally, release the pressure on the blade. The blade should be sitting pretty near center. Try the flipper, if it doesn't work, loosen the pivot screw about 1/4 turn and try it again.
That should fix you up. If not feel free to PM or email me. :thumbup: