Grados simply design don’t need repair.My first suggestion would be Hemp. Then 325X.
For build, based on housing and headband quality, actually Sundara is better than SR325X. Sundara has more premium feels, 325X is more like a simple handmade product that easy to repair/assemble when need to service, which is a good thing.
Meze 99 is easy to repair.I like this design.
Anyone can repair them