Thanks for all your input, guys.
I don't believe the position of the grip on this keris was the original one. When I got it, it was too much bent towards the ganja to be held comfortably in one's hand.
It wasn't easy to get this grip loose from the peksi. But once I was able to take the keris apart, I can assure you that there was nothing with which the handle was secured to the peksi. No 'damar', cloth, paper or similar things.
Only the bent peksi 'secured' the grip. It seemed unnatural to me. Therefore I guess the peksi was bend some time ago. Perhaps it got stuck somewhere.
Now, I'm trying out the best position (for me) for this grip. I'll show some pics when I figured this out.
There was no sheath with this keris. Does anyone know where it would be possible to get a proper sheath made ?