Η διαμόρφωση πέτυχε, μόνο που η λαβή έχει ρωγμή.

πέτυχε is the aorist (simple past) form of πετυχαίνω.

• πετυχαίνω = I succeed / I achieve / I manage
• πέτυχε = it succeeded / it worked / it turned out well

In this sentence, it refers to η διαμόρφωση, so the sense is something like the shaping/configuration was successful or worked out.

A very common pattern is:

• Πέτυχε. = It worked.
• Δεν πέτυχε. = It didn’t work.

Because πετυχαίνω can be used intransitively in Greek, just like English succeed or work out.

So:

• Η διαμόρφωση πέτυχε. = The shaping/configuration succeeded.
• Not every use of πετυχαίνω needs a direct object.

This verb can also mean to achieve or even to hit in other contexts, but here the context clearly gives the meaning worked / succeeded.

For example:

• Το σχέδιο πέτυχε. = The plan worked.
• Η συνταγή πέτυχε. = The recipe turned out well.

μόνο που is a very common expression meaning something like:

• except that
• only that
• the only problem is that
• it’s just that

So the sentence structure is:

• Η διαμόρφωση πέτυχε = the main positive statement
• μόνο που... = introduces a limitation or problem

In natural English, it often sounds like:

• The shaping worked, except that the handle has a crack.
• The shaping was successful; it’s just that the handle has a crack.

So this is not just the word μόνο by itself. The combination μόνο που works almost like a fixed connector.

Because both διαμόρφωση and λαβή are feminine singular nouns, and each noun normally takes its own article.

• η διαμόρφωση = the shaping/configuration
• η λαβή = the handle/grip

Greek uses the definite article very regularly. English learners sometimes expect one the to somehow cover more of the sentence, but in Greek each noun phrase usually has its own article when it is definite.

Greek often leaves out the indefinite article where English would use a/an.

So:

• έχει ρωγμή literally looks like has crack
• but in natural English it means has a crack

Both are possible in Greek:

• έχει ρωγμή = very natural
• έχει μια ρωγμή = also possible, often slightly more specific or emphatic

This is a very common pattern after έχω:

• Έχει αυτοκίνητο. = He/She has a car.
• Έχει πρόβλημα. = He/She has a problem.
• Έχει ρωγμή. = It has a crack.

All the nouns in this sentence are in the nominative singular, except that ρωγμή is functioning as the thing possessed after έχει, but its form is still the same as nominative because it is the direct object and many feminine nouns in -ή look the same in nominative and accusative singular.

Breakdown:

• Η διαμόρφωση = nominative subject of πέτυχε
• η λαβή = nominative subject of έχει
• ρωγμή = accusative direct object of έχει, but same visible form here

That last point can be confusing: the function is object, but the form does not visibly change.

It can mean different things depending on context.

Common meanings of λαβή include:

• handle of an object
• grip
• hilt of a sword or knife
• sometimes even a figurative hold or pretext

In this sentence, the most natural meaning is handle or grip.

So:

• η λαβή έχει ρωγμή = the handle has a crack

Yes, Greek word order is more flexible than English, although the original version sounds natural.

Original:

• Η διαμόρφωση πέτυχε, μόνο που η λαβή έχει ρωγμή.

Possible variation:

• Η διαμόρφωση πέτυχε, μόνο που έχει ρωγμή η λαβή.

That version is still understandable, but it may sound more marked, with slightly more focus on ρωγμή or on the fact that the crack is the issue.

For a learner, the original order is the safest and most neutral:

• subject + verb
• connector
• subject + verb + object

διαμόρφωση is a feminine noun ending in -ωση, a very common noun ending in Greek.

It is derived from the verb διαμορφώνω and often refers to:

• a process
• a formation
• a configuration
• a shaping

So this is the sort of relationship you often see:

• διαμορφώνω = I shape / I form / I configure
• διαμόρφωση = shaping / formation / configuration

English speakers often find -ωση nouns useful to recognize, because many of them name an action, process, or result.

Here μόνο means only, not alone.

• μόνος / μόνη / μόνο can be an adjective meaning alone depending on context
• μόνο can also be an adverb meaning only

In μόνο που, it is part of a set phrase, so you should not read it as alone here.

So in this sentence:

• not alone that
• but only/except that

That is why the whole phrase is better learned together as μόνο που.