A 70's era Kamaka tenor with a slightly separated top undergoing the low tech clamping method I often use. An empty glass weights just a few ounces. A glass full of pennies weights a lot! Just measure pennies for desired 'clamping' force, apply glue, apply 'clamp', clean off squeeze out and that's it. I work in high tech all day long. It's nice to come home and employ some really low tech!