Hi. I have a single handle gerber shower faucet handle that’s leaking and needs a new cartridge. I’m trying to get the handle off to identify which cartridge i’ll need. When i remove the screw in the center of the handle shown, half of the handle comes off, but half remains fixed onto the sleeve. No additional screws seem to be fastening it to the sleeve. I’ve applied a medium degree of pressure with faucet handle pullers, but didn’t want to go too hard with them in case that’s not the best route to go with this model. Any advice on removing this handle would be appreciated. Thank you!