A metal bracket at the base of the distributor that has a nut or bolt which can be loosened to allow the distributor to be moved on its shaft to readjust ignition timing or to open the points for gapping .
DISTRIBUTOR HOLD-DOWN CLAMP
Meaning of DISTRIBUTOR HOLD-DOWN CLAMP in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012