Parents of a 5-year-old child consulted an orthodontist about mispronunciation of sounds by the child. Objectively: the child's face is unremarkable. The patient has deciduous dentition. There are 1-1,5 mm gaps in the frontal segment from 53 to 63. Occlusion in the sagittal and transversal planes is normal. What type of Frankel's functional regulator is used to treat the above-described malocclusion?