the authors themselves are at pains to point this out. keep in mind that it is all about value and convincing the parent that the best value is not at the competition. the more air that is hitting the affected area the better. since the lever arm itself is usually good for further service, then a new replacement base plate is to be made and fitted. once a decision is made you make plans. it’s not about the language one speaks. you should always drive with both hands on the steering wheel so you remain in control in the event of a blown tyre. 