Similar to stretched sprue, you can also use strips of plastic card. I like to do this, if I want to finish the piece separately before gluing into place.
Another option using the stretched sprue approach is to put the sprue after the two pieces have been joined and weld it into place using Tamiya Extra Thin cement.
Excellent styrene shim work on the 262 gun bay covers!
"Surely I have made my meaning plain? I intend to avenge myself upon you, Admiral. I have deprived your ship of power, and when I swing 'round, I intend to deprive you of your life."