So my friend shows me the creaclip so I have a look and say "You what to pay what for 2 pieces of plastic with a hinge?" and embarked on this project.
Step 1: Materials and Tools
I know have a fairly limited set but I don't do many projects (I'm sure a dremel kit would have helped).
And here is the list of materials (note: this is for 2 sets, get less material if you only want one):
5' door jam
Set of 2 hinges and screws
The total cost of materials for both clips is $5. I ended up making 2 of these guides since 5' was the shortest door jam I could get and the small hinges came in packages of 2 as well.
Step 2: Measure, Mark and Cut
After cutting, sand down the ends so you get a nice finish.
Step 3: Make Space for the Hinge
Check frequently to see when you have removed enough material.
Step 4: Add the Hinge
Screw in the screws and then file them down on the other side.
You could add some glue if you wanted to help the screws stay in there.