i've had 2 SERE2000's and did not have these issues. in fact, i moved over to Spyderco's because i started to dislike thumbstuds, but i found the sere2000 the smoothest opening 'thumbstudded' folder ever and did not find the stud sharp.......
i'd check if the pivot is not tightened too strong and also check if the blue teflon-washers are in good condition.
dennis

i'd check if the pivot is not tightened too strong and also check if the blue teflon-washers are in good condition.
dennis