What you describe as a "mount", I assume, is the bulb base. The bulb assembly (bulb, base, and two wires) can be pulled from the back of the S-meter. The replacement bulb assembly is available through Icom parts, if you choose. When I replaced mine, I simply connected the wires of the new bulb assembly to the existing wires, which saves having to do more disassembly and soldering to the local board. I may be wrong, but as far as I know, the bulb cannot be removed from the base. Considering this is a fairly common operation, perhaps someone else can share their experience with this.