Got hold of some Hickory, one inexpensive cupped board. Cut some handle blanks, made a V jig to round them with a plane.
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Then some lumps of white oak, I drilled the 1 1/8" hole with a forstner bit then cut off the corners, over and over.
Some sanding and then had my large knobs for my large hands.
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Took off the temporary handles, added some home made rubber washers to reduce the 'klunk' when the handle drops.
I kept the tail vise handle a little longer as it has more resistance. Tung oil and done...…..No Lathe.
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The knobs have a wonderful tactile feel!