Best invention for dolly grips after the round wheels
The TrackJack is the most fantastic piece of equipment which I have seen for the last few years. I would have never thought that there could be an improvement of maneuvering tracks in a small room or studio-floor.

Just slide the TrackJack underneath a piece of BarTrack, lock it, and wheel your track to the desired position. Unlock the Trackjack and you are set to shoot.

The trackjack is also made by Stian Nilsen (New York)
Watch his video: