[ODPILOT]

        Record changer is M24 and was used in 1953 and 1954 radio/phonographs.  It uses a tilt cartridge with a double needle, one side for 78 rpm and the other side of the needle for 45 and 33 1/3 rpm records.   The cartridge has two contact lugs, (these are the two at the top of the photo, the bottom two are just rivets and do not connect with anything), one as a ground and one to connect with the contact plate (see photo), one contact is for the 45 rpm needle and the other is for the 78 rpm needle. The black round contact on the contact plate is a ground for the  ground lug on the cartridge.  I used 400 sandpaper to clean off the black corrosion, which now makes a much better connection.   The phonograph is mono.   I would assume that I would have to make some sort of modification of the contact plate inside the tone arm to make the newer cartridge fit and work??
Photos attached show the side of the cartridge with the neg and positive contacts and the contact plate that is mounted in the tone arm.  Thanks