So, you are either changing from sponge to plastic, or vice versa?
On an aquabot, on each roller, there are a couple of plastic tabs, that have arrows on the ends, which insert into a slot.
You just have to unlatch them, and you can take off the sponge/plastic. Do the reverse to install.
It's been a while since I did this, but it was pretty easy, takes a few minutes, and no tools required.
Randy