The only five lifed components strikes me as wrong. This chooses to ignore engine overhaul (oh) main transmission oh, carden joint oh, tail gearbox oh, cuff and trunnion oh, etc.
I dont have access to data on the 12B but later Hillers had lifed components within the main rotor head as well as other areas not within the tail rotor.
The Hiller was a fine aircraft particularly for aerial work but it needs more maintenance than an R22.