Any way to fix a shower handle dripping through the stem?
I did as Jack mentioned in the comments. I got some graphite packing compound and placed it around the stem between the two brass nuts. After tightening all down, some of the packing squeezed out around the stem and the silver nut where the drip was. That has stopped the water for now. I guess this is going to be an ongoing maintenance task until the packing wears away.