Junk couplers. What to do with them?

[Sumpter250]

What about all of those junk knuckle couplers.

put them between two slices of bread........would give a whole new meaning to the phrase " Knuckle Sandwich "

Once I started using KaDee couplers, everything else went "by the board", "Deep Sixed". I haven't, yet, come across any application that could be accomplished with any of those old couplers..........and if there should be, I might have some old rolling stock that may still have old couplers........then again, I might not.