Hello:
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On Thu, Nov 28, 2024 at 05:41 PM, Julius Henry Marx quotes himself:
... three grooves (0¡ã, 90¡ã and 270¡ã) would be optimal.
I neglected to mention that while it would indeed be optimal, it is a lot more work at the time to grind the grrove in the column.
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One groove only has to be right with respect to the bolted-on position of the column to define the centre position of the head.
The other two also have to be and hopefully end up being correct with respect to each other.
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Best,
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JHM
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