As noted above, I took the simple route, and used the super glue which worked like a charm. I was going to try Wild Mary's suggestion to use "Coupler Binders" (three posts above), but my exhaustive search of the Menard's website failed to turn up the necessary parts.
Hopefully, one day, I'll get more ambitious and use GUNRUNNERJOHN's excellent fix. Unfortunately, the Menard's couplers do not appear to be repairable with tape or rubber bands -- much better than my old standby for other couplers -- black, trimmed twist-ties!
