Hi, bBrian!
Thank you for your question. There is a small nut and mounting bracket under the sink that is holding the valve body for the handle. We recommend using a wrench to tighten this. There is a special wrench for this. The part number is RP47030. Here is a link to this part:
https://www.deltafaucet.com/parts-product-detail?modelNumber=RP47030
Best Regards,
Rosanna
Answered by: DeltaFaucet11
Date published: 2018-04-20