I have managed to snap the small plastic hook clip that clips over the securing bolts of the non drive side crank arm on a shimano hollowtech II system. I'm not entirely sure how important this part is as the crank arm is keyed and secured by said bolts. Will I be ok without it? For the life of me I can't seem to find a new one anywhere. My last port of call was to email madison to see if they could source them.