I would like to avoid major tooling cost for rubber overmolding for a small part. It's for a custom electrical cable, so the overmold will be about half an inch in diameter and a few inches long. The wire is raw (no sheath) so it's rubber over metal. I'm an electrical engineer and I've never designed a part like that. I understand tooling cost might be in the thousands so I want to check my design before I commit to tooling.
Is this a part which needs to be rubebr for its flexibility, or is this a part where rubebr is just being used for insulation properties? Part of me wonders if, in the latter case, a rigid part would be good enough for prototyping?