My current project is an 8 foot bullwhip. Here’s the core attached to the handle:
This whip is going to be a 4 plait cowhide bullwhip, so nothing fancy, just a working whip.
I use a “doubled” core, I first learned about doing this to my core from David Morgan’s book Whips and Whip Making:
This is a great book, if you don’t have it and want to make whips you need to have it!