ok so i've got an old peugeot from the dump, and it has a pair of stronglight cranks on it. anyway i've decided to keep the cranks on it, both from the fact that i cant remove them and they dont seem like bad cranks, but they are missing their ????'s (sorry i have no idea what their called, this will explain better:


I was wondering if anyone knew if;
1 - is this an issue?
2 - if this is an issue how can it be solved?
3 - what are those bits called?

Thanks