mijostyn"The safest thing to do is buy almost any used 9 " working arm"
Buying a used tonearm or cartridge is kinda like buying used underwear. Who wants that? There is nothing "safe" in buying some thing as fragile, delicate, and prone to damage as a cartridge or tonearm I know there is a guy here who always recommends cartridges that are 50 years old but he's in the business of selling them so that colours his thinking.