It's a real simple suggestion. Newbies, stop buying used turntables!
Why should this only apply to Newbies? This could happen to anyone, Newbie or Oldhand. Oldhand could receive a turntable in many pieces, with no parts are available, or Newbie could receive a NOS vintage turntable perfectly intact. A lot of vintage turntables have NO MORE PARTS AVAILABLE, I don't care how many decades that you have been spinning vinyl, it just no more parts.
If you are a Newbie, (or Oldhand), and you are attracted to a particular vintage turntable, and it has a price that you think you can afford to lose, then you should contact the seller and talk to him about how the turntable should be packed and shipped to minimize the chance for it's plinth to break in half, then take the risk. If it really bother you, then find one locally, so you can go there and pick it up, but good luck finding one locally.
Don't expect anything used is going to be perfect (but of course, the plinth should not be in six pieces either), and come with all the original accessories, if they come with them, then you consider yourself lucky. If it doesn't come with a belt, alignment tool, then go buy one. It'd be a good learning experience. I am a really picky person, and some of the used turntables that I scored are not perfect, and that's why they are called "used".
Buying anything used is risky, it's no more risky to Newbie than to anyone else.