I ai also have this assembly and have only found that the end of the handle has a cap that can be unscrewed but there is no Where that a screw alone cane be is undone.
Thank you for your question. To access the set screw in the Delta Leland H778 handle, to remove it, you would first unscrew the lever/handle part from the base. Then using a 3/32" Allen wrench to unscrew the set screw in the hole, where you removed the lever/handle part from. Below, I have included the Parts Diagram showing where the the set screw is located.
Date published: 2017-05-01