To Use, Lift The Plunger Knob And Insert The Knurled Disc Between The Knob And The Plunger Body, Engaging The Pins In The Slots On The Plunger Body. Allow The Knob To Retract, And Use The Knurls Of The Tool To Screw The Indexing Plunger Into Place. Designed For Kipp Indexing Plungers Without Wrench Collar, Including Part Families K0343, K0345, K0633, And K0634.