Hack -1 You can apply eyeliner By simply placing two pieces of scotch tape such as shown below in picture, your eyeliner will come up clean and straight.
Hack -2 Using a spoon you can easily apply eyeliner as pictured. With the end of a spoon create a straight line at the edge and then create the second line by placing the spoon. Remove the spoon and then fill.
Hack -3 Turn your eyeliner pencil into a gel eyeliner by warming it up with a lighter. Simply place the pencil on the lighter for a few seconds and then once is cooled down apply it as usual and you will see the difference.