Nope not done that, probably should. Do the pistons need to be removed?
If you decide to dissassemble the callipers, bear in mind the bore cap on X2s winds inwards for removal (towards the centre of the calliper with a righty-tighty move), not outwards.
I ****ed up an X2 calliper doing this wrong, as it’s reversed to older model Hopes. I lefty-loosened it with all my might because it wouldn’t come out, which actually, was tightening it. Doh.
Check the exploded diagrams on the Hope site to make sure I’m not talking nonsense. It was a little while ago.
(I have stripped and rebuilt Mono Mini and M4 callipers successfully in the past, and have some X2s that now deserve some attention).