My faucet is leaking near the cross handle. Insturction with cartridge describes that the piece just below the cross handle has to be removed. I've tried a strap wrench, but I can't keep strap from slipping toward top of housing and thus can't torque suffeciently to remove housing. Any tips?

Plumbing - Hansgrohe - 17224 Axor Carlton Vertical Bidet Faucet With Cross...