I order a new AE-3 module for my Epic 4-string because I wanted center detents on the bass and treble controls. Well, the installation went fine, but when I went to put the knobs back on, the collets don't fit! The shaft on the new knobs is much bigger in diameter than the old module. I checked the volume and pan knobs, and they are the larger size like the new ae-3 module. So, looks like I need new knobs, right?