My CRKT MY TIGHE finaly got dull for the first time after almost a year of work. This is by far the longest any knife has lasted before getting dull for me. Yes I will sharpen it and keep using it. But I am thinking about retiring it since the assisted open spring is also starting to get weak. I am looking for suggestions for any knife that might last a little longer. I am a heavy diesel truck mechanic and sometimes my knife has to be used as a scraper, screwdriver, prybar or hammer so I need something tough. It needs to be a folder with assisted open(sometimes I can only get one hand on it), a three inch blade or longer, partialy serated, and have a pocket clip. Thanks for any help.