I have to disassemble and reassemble the fields multiple times a year.  The connection piece is easily breakable if the two tubes are connected and they fall onto a hard surface. 

Print this out and use 0.25x0.75 standoffs for the inserts. 

I included the freecad file if you need to adjust for a different size standoff. 

Print as you would see it on the field for strengh purposes. (seems to be stronger than the supplied piece)