The unglossed root ᴱ√YḶTḶ appeared in the Qenya Lexicon of the 1910s as a variation of ᴱ√ẎATA “join”, possibly via L infix, having a single derivative ᴱQ. yalta “yoke” (QL/106). In the contemporaneous Gnomish Lexicon, the words G. galt “yoke” and G. ilt- “to yoke, join” are almost certainly related (GL/37, 50). In the 1930s, the words ᴹQ. yanta/N. iant were used for “yoke” as derivatives of ᴹ√YAT (Ety/YAT), but later still Q. yanta/S. iant where used for “bridge” (LotR/1123; SD/129). Thus, I think it is worth positing a Neo-Root ᴺ√YALTA to serve as the basis for “yoke” words.