To fit: lock onto a threaded bar with a nut and nylon washer at each end of the bank. Do not overtighten.
To thread: place the yarn onto the hook and keeping the yarn loose, gently pull the yarn in the direction that it will be running, letting it drop down into the bore – do not try to force it past the hook.
To un-thread: pinch the yarn from each side to form a “V” and push the bottom of the “V” over the tip of the hook.
It is not recommended that the yarn is regularly in contact with the hook when running.