A knob ?
If only it were so simple. Bear with me I've been on the champers.
Was just looking for grub screws to do just this.Looks very similar to a pull off cooker knob which might widen your search though WDS as linked previously have a great range of products, failing that a standard knob to fit the dia of the shaft on your saw will work if you drill and tap a hole in the side of the knob then fix to the shaft with a small stud, set screw or bolt which will tighten against the flat section of the shaft.
Look at WDS components or search machinery or tooling hardware
Look on ebay Nick they're as cheep as chips, you can buy boxes with a selection of sizes for about a fiver or just a couple if you want.Was just looking for grub screws to do just this.
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