Sometime in the early 1970s, a radically new model airplane building tool
appeared in R/C Modeler, American Aircraft Modeler, and other
model aviation magazines - the "A-justo-jig."
https://www.rcgroups.com/forums/showthread.php?1246920-A-Justo-Jig-II-wing-and-fuse-jig
http://www.flyrc.com/how-to-use-a-wing-building-jig/
Posted May 29, 2021
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