*PLUMBERSSTOCK EXPERT* responded:
Hi there! Thank you for your interest in our Moen 100556 Part Handle Hub Kit. Yes, you're right! This Moen 100556 is screwed on the unit and is secured with a screw. For reference, please check this Instruction Sheet. According to Moen, the diameter of the base of the hub is between 1.352-1.378 inches and the diameter of the center part of the hub is 1.875 inches. We hope this helps. If this is what you're looking for, just click "Add to Cart" and put your postal code and you're ready to go. If we can be of any further help, feel free to contact one of our customer support specialists at 435-868-4020 or through e-mail @ email@example.com. Have a wonderful shopping!