The incredible precision of LEGO parts makes them attractive for building precise jigs, but the fact that they can come apart fairly easily isn't so helpful for this application. Can anyone recommend
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Le-Glue - Safe! - Non-Toxic! - Non-Permanent! Glue for LEGO® Bricks, Le-Glue is a non-permanent glue that is strong, non-toxic, and will NOT damage
Le-Glue - Non-Permanent glue for LEGO Bricks
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These bricks are like Lego for full-sized buildings