This guide will provide you with all Chainsaw & Oppressor Keys locations in Hit The Roof MC Contract in Grand Theft Auto 5 Online.
There are a lot of three different locations possible for this mission.
Location#1 Del Pero
You have to go to the roof of your club, and you will find a helicopter there. Behind that helicopter is the location that you are looking for.
The helicopter has a chainsaw in it, so you need to remove that chainsaw by using any of your weapons and then take that chainsaw.
Elysian Island location#2
You will need to go on the roof of a building on Elysian island. You can use a helicopter or the stairs as you know it is your choice.
There, you have to fight your enemies, and kill them.
After killing your enemies, go to the location of the roof, as shown in the image below. 
You will find the chainsaw on the left container, grab that chainsaw and take it with you.
La Mesa Location#3
It is a unique location where you have to walk through the door and get the keys from the wall for the oppressor.
This is something that the other two locations don’t have. Once you find your oppressor, you can fly it. You have to come down to another roof on the right side on which you will find the container and the chainsaw will be inside the container.
