Paul, 
 
I made mine from what looks like #13 Copperclad steel wire.  Total length = 4.5 in. 
 
There are 4 bends, all right angled. 
 
   /-------------------\  <------->          0
   |                   |      |              | side
   |  (front view)     |     1/2 in.         | view
   |                   |      |              |
   0                   0  <--- --->      ----/
 
   <-- 2 3/4 in ------->              --> 3/8 <--
 
   /-------------------\  <---
   |                   |      |
   |   (top view)     |     3/8 in
   |                   |      |
                          <--- 
 
Match the 2 3/4 in. dimension with the actual hole spacing of the boards.  The wire really needs to be stiff, maybe from a heavy duty coat hanger.  If you can bend it with a pliers, vice grip, etc., it's not heavy enough.  Use a vise and a hammer.  8-) 
 
Someone else may have a better suggestion.
 
Joe, K9HDE
 
PS  My experience is that rocking the board back and forth (left/right) works better that trying to pull the board directly (up) out of the TR-7.
 

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