HW 50 Circa 1969 Trigger Question.

Hi,
I have an HW50 with a simple stamped trigger blade and a coil spring that is guided by a 'spike'that protrudes from the trigger block.The other end of the spring locates into the rear of the trigger between a couple of square notches.My question is should there be a spring guide that locates into the rear of the trigger or not,because on mine there is none.This can likely be answered by 'Frakor'as I have seen among photos of his HW50'S at least one such as mine.Thanks in advance,mrto.