Pull the pivot screw out, put 1 small drop of blue loctite on the last few threads of the screw. Put the screw back in, with the spine of the blade parallel to the floor you want it just tight enough to let the blade fall about 1/2 way when you release the lock . Do it quickly, then let is set, if you keep messing with the screw once it's been loctite'd it won't hold. it's not going to be perfect, but just keep working the pivot by thumb flicking it open. It should loosen up nicely in about a week.