This may take a little bit of trial and error.

You can use a clamp to hold a leg tight against the table while the wood glue dries if necessary. You can also use epoxy if you prefer. Wood epoxy is going to be stronger than wood glue most of the time, but it’s a little harder to work with. [4] X Research source

You can achieve a similar effect by leaning a wobbly table against a wall depending on how the table wobbles. This only works if one of the legs is short. If the table is wobbly because the joints are weak, this might break the table.

You can monitor how even the table is by putting a spirit level flat on top of the tabletop while you’re adjusting. There are also level apps you can download to turn your phone into a spirit level.

Some furniture tacks have “pressure pads” on them. These are great if you can’t measure the gap between the leg and the floor, since they’ll give you a margin to work with while preventing the wobble.

Make sure that the glue has totally cured before you move the table around.

Wear safety goggles and a dust mask. If possible, make your cuts outside to keep sawdust from getting all over. Keep your hands away from the blade of whatever saw you’re using. If it will make things easier, take the legs off of the table. That way, you can set them on a set of sawhorses or in a C-clamp to make the cutting process easier.

You can also use small blocks of wood to do this if you don’t have L-brackets. That’s going to be tougher though, since you can bend L-brackets, but you’ll need to cut the wood blocks to size with a saw. Some L-brackets come in kits with screws that will work for them. These are ideal if you can find them and the screws aren’t longer than your table’s thickness. If you only have 3 table legs, you can just use 3 L-brackets.

You do not need to adjust the angle of the leg at all. So long as the legs rest on the ground, the angle there doesn’t matter. Your table is wobbly because the joints are weak, not because the legs need adjusting. If you can’t bend the brackets by hand, you can use two wrenches or sets of channel locks to gently bend the brackets to size. These things typically aren’t that strong, though.

The pilot hole doesn’t need to be as deep as the screw. So long as there’s some threading in the hole, the screw should catch. You don’t want to go too deep and risk driving the pilot bit all the way through the table!

Repeat this process on any other legs that needed support. You can do this on every leg if you want to keep things uniform.