Bakelite (pronounced /ˈbeɪkɨlaɪt/), or polyoxybenzylmethylenglycolanhydride, is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde, usually with a wood flour filler. It was developed in 1907–1909 by Belgian chemist Dr. Leo Baekeland.
That "black ebonized material" would be bakelite wouldn't it?
The Marlin spike is used to loosen knots. You force the tip into the knot, push, and twist.It works quite well I've used them often years ago on believe it or knot on kids shoes laces.