Extra strong string to wind, for instance, into the depression around the middle joint. Dia.:0.75mm,length:300m. Material: Vinylon (artificial fiber)
Middle Joint Insert Tool A (with handle), ¥6655
Middle Joint Rasps A+B, ¥19580
Middle Joint Insert Tools A&B set, ¥11550
Middle Joint Rasp A (With Handle), ¥10230