Hi Gerben! I think your point is well taken, I have turned many a concentric ringed bottom on the lathe and I've notice a few things that may give your theory support... one is, the knobs are a more uniform size, dimension, because the forming tool plunges in from the end, and dosen't get anywhere near the outside edge... secondly, the outside dia. of the knob is decidedly more robust... as it is quite a bit thicker then the dished knob end... they are with out a doubt, stronger... this additional strength may have been necessary when banging around on a sea going vessel... the regular or standard mag. bottom probably went away on the first ladder! Best to you Gerben! til...later....GT
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