This is a useful tool. This is not an accurate instrument. When it comes out of the box it is heavily coated in grease and needs a thorough cleaning. This requires disassembly and lets you notice the rough casting work. Pay close attention to how it dissolves. It appears to be a sand cast. It's not consistent, but it's a good start. A little time with a fine stone and 400 or 600 grit sandpaper will do the trick. Assembly seems to be an easy task. Not so. This device appears to have been constructed without any thought of unity. Simply put, it will only gather in one direction. You will have a lot of trial and error if you were inattentive during the disassembly phase. It takes patience to adjust the wedges. But if you go through all of these steps and carefully lubricate each sliding surface, you'll be rewarded with a smooth-running tool that seems to last for many, many years. It takes patience to get it right. You can use it right away, but it's dirty and full of slop. It's built at an affordable price so many corners have been cut. But it's a nice solid little tool if you're willing to spend a little time tweaking it. $10 thrust bearings will also help if you're so inclined.