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Don't use this kind of vise. It's garbage, doesn't hold things well, you will break it, and it's very hard to get things to settle in flat because when you tighten it one side lifts up. I expirimented with using ATF for machine fluid. It was better than nothing, but also not the right answer.

This is part of a throttle body bracket. It is currently installed on my car:

Some other parts machined out, after all the mods but with another issue we didn't discover until after these were done. No harm though, they came out quite good: