Yes,your suspect is realty ,or new cartridge , no second hand , for U.S . much money but no problem or you must modify tonearm for a TP4 cartdrige.YES is a complicate work for dismanteling ,recable and rebalance tonearm but is possible and no problem in future for change needle , otherwise change a turntable with normal cartridge , i have make this modify for a BEOGRAM 5500 many years ago a nightmare and for normal tonearm magnesium black in this time for a beocenter 4600 and 7002 yes is orrible solution but play very fine sorry for my little english from Italy