The simplest option is placing a glass tumbler upside down on it.
Or a larger cover if it's a movement and spread out parts.
Anything that will cover and seal reasonably well to prevent dust selling on it.
Thanks, vinn3. Hmm...Unimat. I forgot about those. I actually do have an SL1000 that I won in a raffle a couple of years ago. I bought the 3-jaw chuck for it. I didn't think of it because I heard that it wasn't considered precise enough for most watch-work. Crystal work is probably not what they're referring to.
So if the 3-jaw on the SL1000 would work, I might be able to do something. Still, I'm not sure of how to order a crystal of sufficient size and thickness to be of use.
Oh, and the epoxy idea sounds like something I could work as well. That way I would just have to break those beads/bonds, remove the movement, and then soak the back to remove the epoxy.