A controller 10 suitable for controlling a bath lift. A transit time from an exit of a UV curing furnace to an entrance portion of a capstan for pulling the optical fiber downstream is set to be 0. A poppet slides within the bore and a spring biases the poppet toward the first valve seat. After positioning the catheter body, the guidewire can be retracted from the distal region and into the proximal region, leaving the lumen in the distal region available for the rotatable working element. The embedded component is mounted in the through hole.