Hipshot Ultralights arrived and were fitted tout suite. It turns out that the original tuners were surprisingly light and the difference was just 130g lighter. However, it was for the better action in the tuners that they were purchased and that end of the bass is now a slop free zone. I still had to pack the ferrules a bit, but it was all pretty easy. Interestingly enough, although it's now only just over 4ozs lighter (a whole 7.2lbs altogether), because of where the weight has been saved, the feel on the strap is quite markedly different. All smiles at Castle MacEz.