I replaced the lifter channel on the driver side door glass today.  The one I had was in bad shape, so I figured I should replace it.  It can be very difficult to install the lifter channel on the glass, if not impossible to do with just your bare hands.  Here’s how I did it using some pipe clamps, and some regular wood clamps.  It was very easy using this method.

First, I took the glass and set it on the pipe clamps.  Like this:

In order to protect the glass, I used a couple of pieces of left over lifter channel weather strip (rubber), and placed them around the glass at the one end of the pipe clamp.  Like this:

I then positioned the lifter channel, and lifter channel weather strip.  I used the blue clamps on each side of the weather strip so it wouldn’t move while putting the lifter channel in place.

Once the lifter channel was partially pushed on to the glass using the pipe clamps, I was able to remove the blue clamps:

Slowly tightening each pipe clamp (alternating each clamp every 1/4 turn to 1/2 turn), the lifter channel gets pushed into place.  Here it is, completely pushed on to the glass (all that is left to do is trim the excess rubber off with a razor blade):