hmm, never sharpened a hollow grind before. Round stones for that one? Or a secondary bevel?
I do want one for life if I get one. That seems the point of the whole affair. Having a ritual with a tool you become to love sounds rather nice. Especially opposed to the horrible machine I have been using a while.
Round stones, nope when sharpening a straight with a hollow grind one uses the spine of the blade as the guide, just rest the spine on the sharpening media along with the edge and sharpen by pushing the edge forwards. In time the spine will wear along with the edge, so the sharpening grind becomes acuter with every sharpening operation, but hollow grinds will eventually wear out, so they are not the ideal, the ideal in my mind is a good wedge or flat grind, where blade over time will just get smaller in blade depth, where a blade with a small depth has it's uses, it is why smaller depth blades are available.
But if one was to get a good new hollow grind when they started shaving I expect it will still be usable in your final days, as it will take a long time for that blade to wear out
But interestingly or not perhaps, on occasion and usually to nail the five o'clock shadow if I am going out anywhere special, I use a 1935 hand cranked Rolls Viceroy scissor action dry shaver and it works beautifully on small stuff and all it requires in maintenance is brush out the 'fluff' with the supplied round bristle brushes and a few drops of 3 in 1 dropped into the mechanism oil hole now and again. I have had this thing apart and it is all brass, pot metal and paxolin inside, a heavy duty construction, I don't see it wearing out in my lifetime.