My Friend the Heat Gun
You will not believe how well my Skyrocket fits the Infuse dock after I modified it with a heat gun. It actually now clicks into the dock and even requires that you push the release tab to get it out.
Here is what I did, but I am in no way responsible for your screwing up your dock by following my instructions. I am happy to take a short video of docking and removing the Skyrocket if anyone wants to see how well it fits.
I unclipped the mount from the suction cup base. To do this it slides left and out(if you have it upside down it would be the other way, just look at the back). Then I took out a pair of rawhide gloves and a heat gun. On the low setting, from about 3-4 inches away, I heated both the back and the front the corner holding pieces at the base of where they attach. Use a circular motion so as not to melt anyone section and basically apply the heat to front for 30 seconds and then the back for 30 seconds for a total of about 3 min per corner. I heated both left corners (away from the sliding usb attachment). Then, I placed the phone in the mount, slid the USB attachment in place and using my gloved hand pushed hard on the left corners diagonally toward the center of the phone at the very top of the corners and held it that way for 5 min while the mount cooled. I proceeded to do the same with the right side corners next, but wrapped the USB attachment in aluminum foil first. Before forcing the right corners in, I took off the aluminum foil and slid the USB attachment into the mounted phone, so that I would not pinch the corners so tight that the slider would not work.
Let the holder cool for 30-60 min completely and then try clipping in your phone. If it is not snug repeat the steps and probably heat the corners a little longer. I just heated them enough to bend with a little force, but not be so loose they warped.