The instructions for attaching the mount bar to my ZD221 lawnmower were easy to follow and the connection to the cylindrical vertical front wheel bearing housings with the provided U bolts provided a very secure mount. However, 4 nylon insert 3/8 in. nuts were not included with the parts and had to be purchased from a hardware store. I am happy with the manner in which the mounting bar is designed, since the broadcast spreader that I attached to the mounting bar did not move about much when I drove over rutted turf.