Lambretta tail light lens screw for late series 2 and series 3 for CEV and Aprilia lenses only.
The Complete Spanner's Manual: Lambretta Scooters by Martin 'Sticky' Round Third Edition 8100072
The Complete Spanner's Lambretta Kit Book
Eibar Lambrettas 1954-1989 by Jaime de Prat Salomone
The Unofficial Lambretta Manual Update by Mark Haines