[tunggulametung]

Hello, congrats for your new find!

I think I've seen similar crosspiece restoration the other day on one of internet auction site but the rattan wrap is horizontal-to keep both halves of the crosspiece together.

I think I see two smaller holes on the first, second and last picture, that ones on the meeting point of the cross piece and the bottom of the taguban. If that is right, it might be similar way with the technique found in older Javanese scabbard/I also found it once on Bugis sheath. They inserted two wooden pin each sides to join the crosspiece with the vertical part. This way it is very pronounce to movement along with wear/time and no wonder it cracked (mostly I've seen using this technique are already movable, crack or broken)

In case you decided to change the crosspiece, I think the (good quality) material is still obtainable in Malaysia ask for kayu kemuning (orange jasmine?) as the local name. Or maybe replacing (patching) the missing piece is another option. On the first choice, you can always keep the original crosspiece. But keeping it as it is now would be as good.