After spending lots of time messing with naguras and tomos, Ive come to the conclusion that a 3 stone system works as well and is much faster. I Use a chosera 1k, midrange suita with atoma 1200 slurry and the same on any number of finishers. FOr my finish I always use a junker blade for 10 laps to make sure no boulders or diamonds are in the mix, DOesnt happen often but it has, and any audible or sensory will tell you whats what before you introduce your blade to your finisher. Nothing new here at all. You can do a 2 stone as well as per Alex Gilmore that works great as well. Variables are your stone cutting speed. A good vintage stone IMO is fast enough to achieve this, I believe the vintage stones have more abrasive than modern mined. Not a rule but seems to be they are faster to me and what I have here proves that, Not looking to say nagura progression is not worth it, just after playing with these things for several years its my go to way.