>>6098726For Revoltechs and VulcanLogs, as long as they are revolver joints you can take them apart no problem. They are just held in there by friction, and has no catch keeping them in.
For RevolMini, the joints besides the wrists are not really meant to be taken out, but since the pegs and balls are harder plastics compared to the sockets they are in it's not that difficult to take them apart either.