As long as you know how to feed a cotter pin thru a hole and bend it properly with a pair a pliers to keep your wheels on the axle this product is awesome. I admit to adding a few extra shims (Washers) on the axle before putting on the cotter pins. It only cost me a dollar at ace hardware. To replace the wheels you need a 13mm and 14mm wrenches. I use it on the job as a mail carrier for bulky and heavy packages. Well worth the investment especially in December!!!! A real back pain savior.