How to Change On-Center Spacing for Jack Rafter Lengths

The Construction Master Pro has a default on-center spacing of 16 inches. But if you’re working with a different on-center spacing for your jack rafters, changing this value couldn’t be easier:

➡️ Enter the new on-center spacing and push INCH then STOR 5

Once you enter your pitch and run, you can confirm your on-center spacing by pushing JACK.
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