καμψῐδίαυλος · kampsidiaulos — LSJ
turning the post, so as to run the whole δίαυλος, running quickly up and down
turning the post (καμπτήρ II) so as to run the whole δίαυλος: metaph., of a harp-player, running quickly up and down the strings, χεὶρ κ. Telest. 4.