the only part I would change is the top dome nut. If I could get a recess nut it would sit better on my bench, ie, with handle vertical.
What I did to make he handle was cut out wet oak bark tanned leather with punches, then using shoemaking paste glued both parts of leather then stacked them onto metal shaft, whilst still wet put washers on and tightened on threads with wing nuts to compress leather. Once dry buff to ruff shape then using different mops on router buff to shape you require, leather is fluffy at this point so using a grit cloth mop smoothed leather down. Placed leather handle into bucket of water for 5 mins, took out then boned handle to give shiny'sh finish on handle. Boned is basically taken an artifcial bone or real bone and rubbing in one direction to give shiny finish. I should say tho that proper boning is when you wet mould a job, you are boning it to close the fibres down and get rid of excess water, basically stiffen the leather. Hope this helps.