The LM12UU drag knife holder buries the blade ejector pin deep inside the machinery:
So a handle with a pin makes sense:
It’s a variant Sherline tommy bar handle, so there’s not much to say about it.
The dark butt end comes from the traces of the black filament I used for the previous part. Even after flushing half a meter of orange through the hot end, you’ll still see some contamination, even with the same type of plastic. Doesn’t make much difference here, though.