The attached copy of a page from the manual shows a circular "clip" (7) anchored by a "peg" (6) to the rope pulley . I dismantled one of these starters today to remove years of solidified oil and grease and cant really se what that clip does . It is in place but doesn't seem to hold or locate anything and the starter operates correctly. Other than being held in place by the peg the clip sits in a shallow groove in the pulley . One end has a small right angle tang and the other is straight.
Over the years I must have fitted new ropes and springs to many of this pattern starter and it's either been obvious what the clip does or it hasn't bothered me !