I recently took my Polaris in to the pool store for repair because the wheels weren't moving. The inline filter screen was cracked and therefore there was debris somewhere in the cleaner. They cleaned that out, replaced the screen and everything was working fine. Well, I accidentally cracked the screen while cleaning it and now the wheels aren't moving again. I really don't want to drive to the store again. Can someone tell me how to do what they did based on this description? Thanks.