Cut out a 3cm by 5mm piece of cardboard and fold in half.
The place a cross over on the board. Put the cardboard like this:
And there you have a reflector! You can take it apart any time.
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Cool! First prototype needed the peg on the interceptor. This one is just cardboard! Both need crossover, for sure, but the first prototype couldn’t be returned after constructing it. But this one Can!