Hi Samson.
I have several of these vises and love them. The trick I came up with was to make a stand for them.
Good news is that it's really easy and very inexpensive.
I bought a wood post cap from the local lumber store and 5/16" coarse thread bolt (1" to 1 1/2" long should be good enough), 2 flat washers, a lock washer and a hex nut.
That coarse thread part is important so that the bolt will match the threads in the vise. But that's easy because it's the standard thread you'll find at the hardware store.
The wood needs to be thick enough to allow you to counter bore the bottom deep enough to bury the head of the bolt along with a flat washer so the wood will sit flat.
One of those spade type drill bits works well for this. Just make sure it's big enough for the flat washer to fit inside the hole.
The wood should also be a size that fits nicely into your hand so you can hold it easily while painting if you prefer over the supplied handle.
I do both, whichever works best for the piece. I often times just hold the vise alone when that feels best. A nice plus is the knurled knob on the vise works well as a rest for your brush hand
The cap post works well as a base as it's sized to sit atop a 4"x4" post and the edges are nicely rounded.
But really, any piece of wood that is comfortable for you will do. You just want it big enough so that the piece doesn't want to tip over when you set it down.
Insert the bolt and one flat washer from the underside into the counter bored hole.
Place the other flat washer, the lock washer and the nut on top and you're done!
I've uploaded a photo showing a 120mm figure with pins in the legs that you clamp in the vise.
But I mostly paint busts so what I do is insert the mounting post in the bust and clamp that in the vise. Unfortunately, I found that the post would tend to slip in the vise when clamped.
To solve this problem, I closed the jaws on the vise and drilled a small hole (1/16" to 1/8" diameter, no bigger) where the faces meet.
Then, when the jaws are opened, there's half a hole in both faces. This way, when I clamp the post in the hole, I have the four corners of the hole gripping the post very securely.
Uploaded a photo of this as well.
Sorry for being so long winded here
Hope this helps.
Craig