You need a 3.5mm jack that sits clean in a panel without exposed contacts catching on cables or fingers. This enclosed socket from Jaycar does exactly that. Mount it, wire the back, and you've got a protected audio input that looks tidy in any enclosure. $5, sorted
| brand | JAYCAR |
| connector_size | 3.5mm |
| mount_type | Panel mount (enclosed) |
| category | Electronics & Components > Cables & Connectors |