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Ganter G7a - exchangeable mouth tubes


I recently bought a very well-preserved 80's Ganter G7a.
As I have read from various contributions from the forum, only the model G7aS should have had an interchangeable mouth tube ... mine, however, already has such a mouth tube, ie the mouth tube consists of 2 tubes, which are very accurately pushed into each other.
Now my question to the specialists. Was there for the Ganter different mouth tubes (different holes, etc.)? Are those still available on the "market"? If then probably only by accident ??

Any help will be apprecited.

I didn't find the right solution from the Internet.

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Thank you.
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