My house was built in 1992.
I have a large shower only in the second bath that uses one of the old Delta single handle controls. I think it is a 600 series from some of the pics I have looked at, but not certain.

Anyway, I started having a small leak about a week ago when taking a shower.
It is dripping out from behind the handle slowly when the water is on. No leaks from anywhere in the off position.

Just wondering what parts I need to do a rebuild.
I would love to replace the entire fixture, but where my back access is to the assembly makes it a nightmare, and more work than I want to get into right now.

Actually I probably should do a complete rebuild after this many years regardless of what individual part is causing the issue.

Thanks for any help with numbers,.......I can shoot a pic if it is needed to identify the exact model.