The handle doesn't have a hole for a screw, it would make a good weapon but I don't know it was meant for that.
I measured it by rolling up a piece of paper, inserting it into the handle, taping the paper and then getting the diameter of the cylinder, which was
19/32". That makes it just under 5/8", probably thick enough for a fancy cane that's not meant to support much weight, I'm not familiar with riding crops and swagger-sticks so I don't know what size they usually were.Rob