New, aftermarket 1/2" cartridge adapter for select Dual turntables. The adapter allows for the use of a standard 1/2" mount cartridge. The adapter is known as Dual part #269-611. It should fit the following models: 505-1, 506-1, 508, 528, 607, 608, 617Q, 627Q, 708Q, 728Q, 741Q, 1254, 1258, 1268. 

Adapter comes with an M2 set screw for securing it to the headshell. Using the set screw (requires a small head slotted screwdriver) is important for proper seating of the signal contact pins and for safety to prevent the adapter and cartridge from accidentally falling out of the headshell. 

Please note when using a 1/2" cartridge with turntables using this adapter an additional add-on auxiliary counterweight may be necessary. See the appropriate Dual turntable operating manual for more information.