The Sweden Ericsson LM Phone was a common sight in many Singaporean households back in the 1970s, normally found in the beige or gray versions. In order to clean up the fingerwheel, also known as the rotary dial, we would need to dismantle the phone. Dismantling the phone also enable us to clean up the inside as well as check for any damages in the wiring when the phone is not working well.
However, there are no manuals or instructions that can be found online to dismantle this particular model. After fiddling around with the phone, I have managed to dismantle it and below is a photo of all of the parts laid out.
To remove the main housing, we will need to locate the screw which is located under the handset area. After unscrewing it, the top casing can be easily removed. The 2 holes on the number dial plate is actually a special type of screw and can be removed by turning it. To remove the finger wheel, we would need to unscrew the metal finger stopper by locating the screw behind the rotary mechanism as shown in the top left hand corner of the photo above.