Unknown bike brake system component
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I am currently in the process of restoring a vintage Tsunoda Grand Prix bike, and have replaced the caliper brakes with new ones, however there is a part on the brakes which is made of plastic and I would like to replace, but I cannot figure out what it is called. It sandwiches the caliper spring in between itself and the calipers, any help would be greatly appreciated. Unfortunately I cannot post a picture of the part as this is my first post on here.
Thank you, Ben
Thank you, Ben

