Ive chosen to make a couple of tools for the neck straightening and fret levelling, reasonably happy with the results, the 2 aluminium tubes are dead flat and I used double sided tape to adhere 240grit sandpaper and went ahead levelling the frets. Quite a few high ones, permanent marker and carefully watched after every sweep over the frets. The rockers I created from a smaller stainless steel ruler. So far so good, now just have round off and polish.