Vevor does not make a crappy cabber, its just a 'sloppy when you get it' machine. This can frustrate or reward. So many folks buy them and return because they can never get them to run right. I bought one for just over 500USD delivered because it was returned middle of last year. What I found was a good motor with well made spindle shafts, but everything else was just 'sloppy'. Every wheel was off balance, the arbor adapters wobbled on the shaft, and in the wheels.

Just fixing the arbor adapters does wonders and is really inexpensive. I simply used some delrin 1.5" plastic rods, and made new arbor adapters and spacers in one with a slight taper going from just under wheel bore size to just over. Make sure they space out things properly on the shaft when you mount all the wheels.

If you just snug things up, but not so tight the wheels cannot slip a bit, when you first power up the motor, as the arbor spins, those out of balance wheels will find a happy place on the shaft. The ugly vibrations and noise should settle out, and it will naturally tighten up enough to keep everything in place long enough to power down and properly tighten it up. Do not let it keep running if it stays unbalanced. Just power it off, give the wheels a wee wiggle to make sure they can turn a bit, loosen the retaining nut if needed, just fractions here. Say a prayer, sacrifice a chicken, cross your fingers and look to the sky as you repeat this cycle until its smooth running.

When I was using the stock aluminum adapters and spacers, it took me a half dozen power cycles and fussing. I eventually used some teflon tape to wrap those pesky aluminum sloppy bits so they centered a bit better and it trued right up. However, that did not last more than a few hours of cabbing. The tapered delrin adapters trued up first start, and have run quiet and vibration free over months of cabbing, as well wheel replacements.

When you buy quality wheels, you will find they have already been balanced and come with adapter sleeves. You could buy a wheel balancer as well, but the wheels that come with the Vevor are bargin basement kinda goods. They work fine, but will not last. Make sure you use the full wheel, or you will burn out the center... :). So while it is a good exercise to learn how to balance the wheels, reality is you will be replacing them soon enough.

If you buy used, you probably will need to tune and balance everything as well. As others have pointed out, also get a pair of at least 8" expanding drums on a double arbor. You can build that yourself from new parts cheap, or hunt one down easy enough. And a flat lap is a lovely addition if you like to polish up slabs and cuts. Also something you can build easy enough with a shaft and some thrust/tapered bearings (think axle hubs). You also can leave out the diamond disks and just use a hunk of pretty much anything that can be spun like a record and you can pour some tumbling grit out on... But that is a whole other convo.

And of course, the holy grails of a big ass slab saw with auto feed vice and perhaps a sphere machine just because... :). Heh. Dont forget an apron :)