Title: Basically useless
Product review: In theory this would be a practical tool for restoring a car's alignment after replacing a strut, but sadly it is not. First, while the magnet is strong enough to hold to a hub, there is essentially nothing to attach it to on most cars because a front wheel drive axle protrudes beyond the hub and the axle diameter is too small for the magnet to be solidly attached to. Second, there is a little wingnut that is supposed to "lock" your measurement in place, but anything stronger that a mild breeze will overcome the resistance provided and render your measurement useless, thereby rendering the whole purchase useless. My advice is just to use a carpenters level. It won't be accurate enough to skip the alignment shop, but it will be accurate enough to get you to the alignment shop.
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