Hello, guys. I got a Pbass which has a problem on that large piece of metal inside its neck (i don't know how to say that in English). So due to this fact, I want/need to install a set of strings with different gauges. I got GHS boomers 045, and Im interested in flats but... 040 flats in order no to push the bass' neck harder than it can handle. What do u guys think of it? Much difference from 040 to 045? Weight, sounding etc? Thank u in advance.