I have a few questions regarding maintenance of my dhol, i would greatly appreciate your help.
Dhol type: Sheesham, dagga: goat skin with strings, treble- nylon with screws

Dhol type: Sheesham, dagga: goat skin with strings, treble- nylon with screws
- When loosening the dagga after practice, should i loosen all the rings of all the strings? or loosening a few rings would do?
- the dagga side seems a bit uneven on touching when loose. does it need oiling or sun? if yes how to do it?
- do i need to oil the inside or outside of the dhol? i live in north india and the temperature varies 45C [0-45] round the year.
- the treble side loosens on its own after some time. is it normal?