POP-UPS WON'T SPRING BACK DOWN. I'm fixing a springler system that has been neglected from a foreclosed house. The system has both Torro and Rainbird Plastic Spring-Loaded Pop-Ups. After digging them up, taking them apart, cleaning them and raising them. It seams that the Rainbirds work fine, but most of the Torros don't want to spring back down. Since I need to replace the Torros I was wondering if the Rainbirds are a better product. The only difference I see is that the Torro uses a rubber seal were the Rainbird does not. Thanks.