For maintenance, its easy, since it's not glued like audeze LCD series as example, you just need 1 mini screwdriver and you done, slip the earpads on the provided rings after you unscrew it. Basically, you dont really need the screw, just put on the safe place for easier replacement, therefore if you stick to original earpads, the process is so easier to do to replace the pads.
However if you used 3rd party earpads, to make it perfectly safe attached, you must use the screw because there's no provided original screw hole pin like original earpads, so you must use the screw for 3rd party pads (if lost no worries you can replace with another screw with same size), but be careful of the rings itself, there's no replacement anywhere as far as i know, if thats broken, then you basically fcked up, that's the only caveat, just gently and be careful, i think you will be ok.
You can find alternative 3rd party pads lambskin on ebay or aliexpress or others, it's not hard to find.
I have third party pads lambskin and original earpads, third party pads is more thick but comfortable as well as the original.