Gert, have you come across CA wicking? We run classes for over 60's putting little boxes together made of 1/2" square cypress pine. The bits are held in a simple jig using similar clamps to the sandpit ones. They put drops of CA glue on all corners. Wait 10 minutes then put a few more drops on the outside. The glue wicks right through and will never break. Sorry the pic is down under!