A small low profile machine vise

Step 7 Swivel base

I made the swivel base at the same time as the vise, and it helped mounting the vise in different places but was not very good for its stated purpose because there wasn't any register between the vise and swivel plate except the clamping screws, which aren't fitted to the lugs on the vise, and I didn't want to weaken the vise by milling a key slot in the bottom. It wasn't until last week I realized it already had a square slot in the bottom.