I've had this pair of Motorola walkie talkies for about a year now. They were cheap and cheerful and perfect for contacting my mates while we were snowboarding.
However I discovered that taking my gloves off and unzipping my jacket pocket to answer my mates calls every 5 minutes can get quite frustrating, and cold. Especially when it turns out not to be my mate but some random talking to his mates on the same channel.
Anyway, long story short, I decided to install a headphone socket so I can hear and respond to my mates without having to remove the radio from my pocket.
Step 1: Crack It Open. (Not Literally).
So here you have the main ingredients for this mod. 1 Motorola walkie talkie and a 3.5mm headphone socket salvaged from an old PCI 56k modem. The socket has two switched contacts so that when a headphone is plugged in it breaks the circuit to the radio's speaker and therefor only plays sound through the headphones. I find this feature particularly useful when I'm playing airsoft/paintball so the loudspeaker doesnt give away my position to the 'enemy'.
If you havent got an old PCI modem to destroy you can buy the sockets from Maplin(79p). I'm sure you guys across the pond can pick them up from RadioShack, and DickSmiths if you're Down Under.
Anyway on with the show. Find the screws, mine were under the battery cover and unscrew them. Put them somewhere safe, I know what you're like!
Gently pull the casing away from the electronics being careful not to rip the wires from the loudspeaker.