Adjust staff sling crafting requirements

[Solusphere]

Is your feature request related to a problem? Please describe.
The staff sling/fustibalus currently requires a tool with a hammering quality of 3 to craft, AKA a commercial-grade, modern hammer, meaning unless you happen to find one, it requires a full metalworking rig to craft. The current design consists of a long stick, a single nail, and a regular sling. I can't see any good reason why a makeshift hammer/stone hammer wouldn't suffice to hammer in this lone nail. A fustibalus is not inherently a precision instrument, as demonstrated by pretty much every picture I could find of a real one. In fact, almost every version I've been able to find simply uses knots, and a single one that didn't used a stiff, tightly-wound wire. The nail being a requirement at all is a bit odd.

The wood sawing requirement seems reasonable, as it's low enough to be fulfilled by a stone adze and could represent whittling a random stick into the desired shape.

Describe the solution you'd like
Remove the nail and hammering requirement from the recipe. Replace it with a Sewing 1 requirement, and possibly add a tailoring 1-2 requirement to the recipe, to represent knowing how to tie a good knot and otherwise properly attach the string to the staff.

Describe alternatives you've considered
Simply downgrade the hammering requirement to 2, which lets you use a makeshift/stone hammer, but still requires a nail, making this solution still problematic to anyone trying to make this in a pure innawoods situation.

Additional context
More crappy fustibalus pics!

Not a nail among them, but plenty of knots. Several of them include that little wooden ball, so adding a wooden bead to the crafting recipe might make sense too.