Reply by DS

I just use regular bar clamps.
On thin stock, I’ll usually put a spring clamp across the joints to help keep them flush.

If your parts try to bow or flex under the weight and presure of the clamps, you can lay them on a peice of plywood scrap and clamp the joints AND the plywood with the spring clamps. That ensures things stay where they should until the glue dries. (Wax the face of the ply scrap, or use wax paper or plastic wrap to keep the glue runout from bonding your workpiece to the ply.)

I’ve even been known to use spring clamps to secure thin stock to the bar of the bar clamp, since it was just sitting there all straight and in the right place.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251