The ETC ColorSource DMX Relay (CSR-D) (4410A1030) has no internal user-servicable parts.
The ETC ColorSource Wireless Transmitter (CST-W) (4410A1000) and ColorSource Relay with Wireless DMX Receiver (CSR-W) (4410A1010) have an external antenna that can be replaced if lost or broken. It is ETC Part# N1084.
The ColorSource Wireless Transmitter ships with an external 12v Power Supply. It is ETC Part# PS447.
Tabletop feet (round rubber feet) are available as ETC Part# 4410K1000.
The screws that hold the plastic case together are ETC Part# HWM1796 M5x10mm Ph PH MS ST BO