In his Outline of Phonetic Development, on page 58 of PE19 Tolkien introduces the somewhat unexpected (for me) compound word tálgárta "high boot", a compound of the well known tál "foot" and gárta "hide, 'leather'" (hitherto unknown). What can we make of this word? It is not entirely clear for me from the text which stage of Quenya this compound is from; though item (e) on top of p46 confirms that medial lg remains lg in Parmaquesta (but turns to ll in Lindarin); it does not say what happens in Tarquesta and later.
So assuming that the word is allowed to stand (is it?), can we do anything with that second element? Would it, as a standalone word "leather", take the shape *gárta => *ʒárta => arta? And if, say, I'd combine it with má "hand" to get "glove", would it be *mágárta => *máʒárta => *marta? See (c) (iii) on p32 saying that between identical vowels medially g => ʒ => vowel contraction, otherwise g => ʒ => y. Or should we imagine a scenario where *máʒárta would intentionally be turned to *máyárta to avoid a clash with the adjective marta?
What do you think?