Look near the end of page 2 of this thread, there's a video of how to install rivnuts without spending lots on a tool: 

 

Breezy Pete, Rivnuts seem like a good solution and I've considered it, but is there a danger of the flanges on the rivnuts holding the panel away from the door and allowing water leaks?

3 hours ago, Philthyfresh92 said:

Hey Guys!! sorry to bring up an old thread! but is there anything we can use instead of the rivets? As my window appears to get stuck down a few times, even after fitting a new mechanism. I am just a bit scared to commit with the Rivets on the door and then it gets stuck again!

 

Fit it correctly, then it won't get stuck!

2 hours ago, grumpy1 said:

Breezy Pete, Rivnuts seem like a good solution and I've considered it, but is there a danger of the flanges on the rivnuts holding the panel away from the door and allowing water leaks?

 

Yes, the Rivnut flanges will hold the panel very slightly away from the door and may require sealant. But sealant should be used even with pop rivtes as the panels usually leak.