I reckon I might have the same bit set you do DK! I put the roundover bearing on the flush cut bit and that's what I thought created the 2mm channel - but my measuring may not be that accurate. I had a look at your build - can I ask what the size of that black binding you used is? It may be that I might be okay with what I've got, as long as I can get white binding in the same thickness you've used...