I recently purchased a CUDA and am very pleased. The lockup on my CUDA is a little wobbly from side to side in the open position. What type of hex,allen, etc. tool could I use to attempt to fix this problem...or is it normal. I don't really like to return knives unless I have to. Also, what is the best type of lube to keep the CUDA's opening action smooth?- It actually seems to be getting harder to open the more I use it. Thanks for any info.