1 subvamp 4 months ago Hi Folks!Anyone here done the Callaham string shaft and/or front roller upgrade? I understand the shaft swap would make it easier to restring, and the front roller being grooved would in theory keep the strings from sliding on the bar ever so slightly when doing Bigsby work, but I'm not sure if it would make a huge difference. (sort of the ol' "if it ain't broke, don't fix it" thing )Has anyone here done the upgrade? What are your thoughts? Thanks in advance.