I can pull the handle off my grohe 333 but it is leaking from the base. There is another small hole at the base but it doesn't seem to accept an allen wrench. I could probably pull the cartridge . Do the leaks usually come from the cartridge or where the hose ties into to it. I can't seem to get at the spot where the hose ties into the cartridge. if I pull the cartridge will I be able to get at that spot?

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