Roman explains here why a single piece windmill shaft that interlocks with the pinion gear at its end is a preferable option than a three-piece mechanism where the parts are joined by welding.
In order to improve performance Roman manufactured with a lathe (torniyo in Tagalog) a single-piece shaft whose head ends with a toothed head that engages the pinion gear (known sometimes as drive gear).
Avoiding welded joints Roman tries to prevent the shaft from wiggling, and progressively bending until complete failure of the pumping mechanism.
Roman highlights here that his solution is more expensive but potentially more durable.
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