This root appeared in the Qenya Lexicon of the 1910s glossed “feel with the hand, handle; appraise, tax, assess, assay; try, test, essay, endeavour” with the verb ᴱQ. toko- of the same meaning and ᴱQ. tókele “handling” (QL/94). There are no signs of this root in Tolkien’s later writing. I think it is worth retaining a Neo-Root ᴺ√TOK “appraise, tax, assess, assay”, but the sense “handle” is better addressed by the later root √MAH or √MAƷ (PE17/163) and for “try” I’d use √RIK (PE17/93).