I attended a tying session once that was hosted by Paul (i dont know his surname) who ties all of frontier's speciality yellow fish flies.
On that day he tied a water dog and he used wax free dental floss. He said you have to use a strong bobbin though since you will break the tip of the bobben of the ceramic type. You can really bull hard on this to make the hair spin propperly and you dont cut through the dear hear either.
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