Pivot shoe screw for the 15-046

A quick learner from USA says:
I ordered new pivot shoes (15-046) and spiral balances (S600-35) for some Patriot tilt-out windows in my home. However, I have noticed that some of the shoes have a screw attach on the pivot shoe. I guess this keeps the spiral balance rod from slipping out of the pivot shoe grove. Is this required using the 15-046 pivot shoe? If so, what is the demensions for the screw.
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Paul from SWISCO responded:
The screw is not necessary, but if you're more comfortable using it then your local hardware store will have it. I believe it is a #6-3/8" truss head screw.
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