OS. [oi], [ǭi] became [ui], [oi]; [oi|ǭi] > [ui|oi]

What could the noun "print" = " a result of pressing" be in Quenya? We do have the verb sanga-, from STAG, and the nouns sanga and sanguma attested.

OS. [ei], [ou] became [ī], [ū]; [ei|ou] > [ī|ū]

OS. [j] became [i] after vowels; [VjV|-Vj] > [ViV|-Vi]

It is well known that non-initial y ([j]) became vocalic [i] in both Sindarin and Noldorin. This is reflected in its spelling system, where i represented a vowel in the middle of words, but y at the beginning of words:

OS. [ā] became [ǭ]; [ā] > [ǭ]

In (Old) Sindarin long [ā] developed into [ǭ], and then later [ǭ] became [au]. This sound change is discussed in the second version of Tengwesta Qenderinwa from around 1950, written during the transitional period between Noldorin to Sindarin:

OS. [eu] became [iu]; [eu] > [iu]

OS. [z] vanished before [d] lengthening preceding vowel; [Vzd] > [V̄d]

In Sindarin and Noldorin, [z] disappeared before the voiced stop [d], modifying the preceding vowel, though the exact phonetic rules evolved between the conceptual stages of the language. For Sindarin, this change is described in a couple places within notes on the Outline of Phonology [OP2] from around 1950:

OS. long final vowels were shortened; [-SV̄] > [-SV̆]

Primitive Elvish words often ended in long vowels, but in (Old) Sindarin these vowel were shortened in polysyllables, and later still, these short final vowels vanished. The evidence for these sound changes is so ubiquitous that it is not a question of whether these changes occurred, but when.