the style described above is recommended to be hand tightend for installation.(or with adjustable wrench as in the directions)There are crenalations in the attaching nut which should tell that a special wrench is required for a firm attachment.. Other mfg. do this and is the thing to do.no wrench is available to increase leverage so i used adhesive at the baseplate User's recommendation: if newly installing unit create wrench possiblye from 1.5in pvc pipe.