Johan, I just had a look at the gandar that David mentioned.
It appears to have lost the tongues at the top for attachment to the gambar.
To fix this problem you make a couple tongues out of bambu , inlet the inside of the gandar and glue the new tongues in with 5 minute Araldite. You use bambu because you can make the tongues as thin as you need and there is still strength in the material. Don't forget to score the inletting and the tongue to improve adherence of glue.
On this old gandar it is obvious that the buntut was not attached by use of a tenon on the end of the gandar, but I believe you will find a mortice where a tenon from the buntut fitted into the gandar.
If you have acacia woods available in South Africa, you might find that you can match colour and grain approximately with that material. If not, don't worry about it, finish the one you've started on.
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