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Hi agepbiz.
I printed on a Replicator 1 in ABS with 0.27 layer height - which may have made the parts slightly oversized and he joints tighter.
You could try imitation's excellent suggestion of using a hairdryer to soften the socket (which the peg goes into) and squeeze it a little with pliers. Or, there's Jorlack's suggestion of drilling holes and threading an elastic band through.
Sorry, I really must get this redesigned in OpenSCAD and Customizer.
Good luck.