Advice for Fist of Ilokano Bolo

[Battara]

Greetings folks,

I am restoring this Katipunan Ilokano bolo. The missing silver parts of the horn hilt are done and I finished the silver mounts on the replacement WWII scabbard. At the end of the hilt is a ball that is the end of the tang.

What perplexes me is the hole in the fist fingers. Would it have been for a silver ring (several examples have this), a tassel, or what?

Thanks in advance for any help you can provide.