Installing a CW Narrow filter into an iCom IC-725 HAM radio (& example results)

The iCom IC-725 Transceiver receives CW (Morse Code) natively, but you can install an optional "narrow" CW filter that gives you greater sensitivity / out of band rejection. The FL-100 (500Hz notch) or FL-101 (250 Hz) notch are suggested in the IC-725 manual. I instead installed a FL-232 (350Hz) filter which is designed for later ICOM radios, but has the same form factor, and is designed for the same 9.01 Mhz IF that the IC-725 uses. This is a "happy medium" between the 500 and 250 sizes (Plus, I found a FL-232 for sale at $80, while most of the FL-100 and FL-101's I've seen are 100-150 shipped from Japan. Installation requires you to open the bottom cover of the radio, but is not otherwise difficult, as the circuit board has sockets underneath, making it a simple "plug in" install. I was lucky enough that the used FL-232 filter I purchased came with the thin clear rubber "anti-vibration" pad, which prevents from inadvertent short circuits and makes it less likely to detach.