A verb appearing as G. ilt- “to yoke, join” in the Gnomish Lexicon of the 1910s (GL/50), likely based on the early root ᴱ√YḶTḶ (QL/106).
Neo-Sindarin: For purposes of Neo-Eldarin I adapt this early root as ᴺ√YALTA “yoke”, so I would adapt the Gnomish verb as ᴺS. ialtha- “to yoke”. For “to join” I would use ᴺS. ianna-.
A verb in the Gnomish Lexicon of the 1910s glossed “to stick in, prod, prick”, likely based on the early root ᴱ√ᴵLTᴵL “thrust in” (GL/51; QL/42). Tolkien specified that the person or thing pricked was in the dative: G. on iltathi nin pieg “✱he stuck in to me (dative) a pin”.
Conceptual Development: Elsewhere in the document, Tolkien had G. elta- “to thrust, dig, poke (inward)” perhaps based on ᴱ√ELE “drive, push, thrust, send forth” (GL/32; QL/35). This was revised to elta-, eltha- “draw, tug, lug”, and finally G. eltha- “to alter, change”.