Once the bass bar is in place, it is time to close the instrument. (Glue the front to the ribs.) This closing clamp set is my home shop set, and I can't remember where it came from. They were given to me after a violin shop closed, but I do not remember which one. They have lovely, smooth threads, and you can feel the pressure on the ribs as the clamp is tightened. That allows for very precise compression.
My other closing clamps have round pads, and I am still getting used to these square ones. They seem to allow for a more even pressure transition from one clamp to the next, but that could be wishful thinking.