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Others might joke about Thag and Oona, but I don't see this as an
unreasonable request. Most common sewing threads will be totally
unsuitable because they have a built-in twist. If you try to hang a
heavy weight from a common thread, the weight is likely to spin and
spin until the untwisted thread breaks.
getting the correct elasticity (don't want the mass bouncing) and
strength (don't want it hitting the floor). For long-term
observations you don't want the thread to twist or change length when
the humidity changes, either. Presumably the reviewer would like you
to provide a reference to a source of thread or string that is
suitable for your application so that the reader can set up the
experiment for himself or herself.
These properties of thread are probably precisely why Cavendish
resorted to a difficult-to-make quartz fiber for his balance.
(who makes thread Oona's way, and it's not that easy)