This is the counter balance I built for my nest box lid. They get heavy if you shingle them. The white pvc pipe on the right is the weight and is filled with cement. I got lucky with my guess on size for this. When you lift the lid is stays where ever you put it!
Notice the cable that goes from the middle of the lid straight up to a pulley, then right to another pulley and then down to the large cement filled pvc weight. The weight is also on a guide wire the runs top to bottom on the right hand corner to keep it from swinging. If any one wants more detailed pics I have them.

Notice the cable that goes from the middle of the lid straight up to a pulley, then right to another pulley and then down to the large cement filled pvc weight. The weight is also on a guide wire the runs top to bottom on the right hand corner to keep it from swinging. If any one wants more detailed pics I have them.
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