How does one remove an electrical cord strain relief bushing/collar like this one:

Source: https://www.centurytool.net/100385_Robinair_Power_Cord_Strain_Relief_p/ro100385.htm
This is the spec sheet for a nearly identical strain relief bushing.
Ideally, I would like to remove it so it can be reused, if that's possible.
The existing one is attached to a garbage disposal (disposer), so there is no easy access the inside of the unit. I seem to recall there is a special type of pliers that can be used for this task, but I would prefer not to have to go out and buy yet another tool for this simple task.
After more searching, I found that this amazing gentleman has a special set of pliers for the task, but I don't have those pliers, and I couldn't find any place near me that sells them.