Go to a hardware store and Find a stainless or other water proof drawer pull of an appropriate shape and pick up alternate bolt/screws depending on how you want to attach it. Remember to use a dab of clear silicon adhesive or caulk to keep it water tight. Sorry about the orientation of the pictures. Steemit is insistent on rotating them to this degree
[20190804_135024[1].jpg]
(https://cdn.steemitimages.com/DQmYUHzNtiN5CeiCL1Q6A9qn9ESkaQENBHeVmERKKqz89P5/20190804_135024[1].jpg)