This has me a little confused here.. I have never come across a rachet itself being loose. The 3 prong disc keeps pressure on the wheel since it is sprung. I can understand how the single screw that holds the bridge with the rest of the winding train in place could cause the wheels to not align as Dorsey says but I think that also is uncommon (in my experience). To me the most common problem is the click spring as TG suggests. The thin flat click that was used tends to wear on the end over time and the only way to cure it is to replace it. Some of the earlier movements had a much more substancial click that was more similar to other watches and did not wear.
Here are the 2 click versions side by side. The one on the left is VERY prone to wear.