Bent socket ears can come from several reasons. The most common is after sharpening when the socket is adjusted, trying to push it on the hinge may bend the ears. The ears are adjusted so the blade fits snug the first time on the hinge. If the blade is slightly crooked when you put it on the hinge, the ears may bend as you try to force it on.
To start, take a pair of pliers and bend the socket back down level with the bottom of the blade. It’s probably bent from you trying to push the blade on and failing because of the bent socket ears that won’t let the blade lock on. The blade will feel like it’s pushing away from the clipper.
Take the pliers and grab the socket ear as shown. Ever so gently, slightly twist the ear outward as illustrated by the arrow in the picture. Bend it too much and it will break off so be careful. Bend the other ear in the other direction outward.
If your successful, the socket ears will look normal and the blade will lock on the clipper. These ears can bend in a number of ways, but this procedure is to help you fix the problem and use the blade.
We have see this happen several times where a groomer will get a blade and this prevents the blade from locking on the hinge. It's OK to fix this yourself, it will save time and get you working again. One thing to remember, don't try and force any blade on your clipper until you find out what the problem is. This problem is simple and easy to fix, but you have to know what the problem is.
Be safe, and read those labels!!!