I sent an inquiry to Zebra USA about replacement parts for the Sharbo X (ST3). and have not heard back. I wrote to them a month ago, using their online inquiry form, then tried again recently.
The Zebra USA website doesn’t show any multipens in their product listing. I wonder… if they never sold the Sharbo X officially in the USA. Perhaps they just can’t be bothered to reply, if they know they can’t help me? I’m looking for an eraser cap. One from their standard black model would do. It’s actually for a dotted model that’s really hard to find these days:
For some reason, the prior owner had said the plastic ring around the cap had cracked and they just pulled it off. You can barely make that out in the photos.