Newbie received Dual 1249 gift, need advice...

A client gave me his old Dual 1249. It has a Signet Model 100 Cartridge attached. The darn thing keeps repeating 3-5 second passages anywhere on the disc. I managed to locate a copy of the owners manual online, but it doesn't seem to be much help in this case. It seems that the arm needs more weight on the needle to prevent this.

The manual states that any cartridge with 1/2" spacing and weighing 5.5 - 10 g (including mounting hardware) should work.

Any thoughts?

Thanks,

RV