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Center rod is threaded to install the slotted adapter shown in your picture.
Thanks to the miracle having a stove, pot of water, and a meat thermometer:
Rod begins to extend at about 125 degrees F, is fully extended somewhere past 150 degrees F.
Full extension is 3/4 inch, from room temperature and then measured at 200 degrees F.
Bolt hole circle, center of hole to center of hole, is 3-7/8 inches.
Hope that helps.
