Troubleshooting a redox probe sealing issue: dialogue between client and advisor.

Client:
Hello, I received the redox probe but it is not waterproof, it needs to be returned.

Technical Advisor:
Hello, what do you mean by not waterproof?

Client:
It means not waterproof. Water is flowing between the green and orange plastic.

Technical Advisor:
It's probably because the O-ring is not compressed enough, it is the one that ensures waterproofing.

Client:
No, that's not it. It's perfect. It's the part between the two plastics.
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Technical Advisor:
I understand. The water should not exceed the level of the joint. Try tightening the probe a little tighter. If there is a problem, we guarantee it.

Client:
The O-ring is tightened properly. I unscrewed it three times and tightened it back three times, but the result is the same.
In my opinion, it is a manufacturing defect. It can happen.

Technical Advisor:
Strange. Can you take a picture of the probe holder?
In that case, we will send you a new probe. Is that okay with you?

Client:
What does the probe holder mean?
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This is the correct probe, it's just not well manufactured.

Technical Advisor:
The place where the probe is screwed in.

Client:
Sorry?
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I don't see the purpose of showing it, but okay.
So, what's the next step now?