Please, see our suggested knot-tying document by John Kovac.
Notice: After creating your string knot, add a wooden, metal, or strong plastic crafter's string bead for non-slip strength before feeding the string through the soundboard & up to the Neck. Or, use a thick piece of nylon harp string within the knot in place of a bead.
Bass String Specifications:
Bass strings: Wrapped Nylon/Nylon
Colors: Clear, Red Cs & Blue Fs
Lengths: Available as listed for this harp
Tail Lengths @ Neck: Default 10 inches
All wrapped bass strings come with a leather washer/knot (see picture).