The problem with those (and the Viz BB) is that the sleeves on the axles are too short - this means it kills the splines on your cranks, and it doesn't preload the bearings correctly. Instructions aren't really needed for such a BB, if you need help then your retailer will be able to help you out. Similarly, if the tool doesn't fit properly then get it touch with your retailer and they should help you out. You can't crush the bearings due to the way the BB is designed. In fact, I can't think of a BB on the market that uses the crank arms to preload the bearings - that would be such a bad idea! Adam