Threaded hole in top with screw in acorn nut and brass split washer. 6v Ignition coil.
12V WET ACORN NUT SCREW IN TOP IGNITION COIL AS LUCAS DLB100 MG MGA MGB AUSTIN
Classic Car & Motorcycle HT Lead to Coil Acorn Nut Long & Contact, 105036C
6 X DISTRIBUTOR ACORN NUT SCREW TERMINALS 6 BRASS SPLIT WASHERS 6 1930-60s LUCAS
IGNITION COIL LONG SCREW IN ACORN NUT WITH BRASS SPLIT WASHER AUSTIN 7 MGA MGB
Acorn Nut for Lucas Magnetos, LU410600 fits 7mm & 8mm Ht leads
Lucas type Long Acorn Nut Screw in Ignition Coil HT Lead for pre 1960 cars