Unit arrived well packaged; assembly was fairly easy except for mounting the grinding wheel. The directions shows that you have to insert a key into a hole in the arbor via a hole in the wheel guard. The problem is that the hole in the wheel guard does not line up with the hole in the arbor. Had to insert the key at an awkward angle. This made getting the wheel on and tight difficult. The chain clamp does not clamp the chain when it is in the groove. The clamp will work without a chain in it. Need to try and adjust it so I can get a chain to clamp before I can actually use it. Had to go back to filing my chain until I can get time to see if I can get the clamp to work. May not need the clamp as the stop may be able to hold the chain in place while grinding. But with wood to cut I have not had much time to play with it.