If you prefer not to use the traditional Motor Totor then you may want to consider using this PVC Totor that I made. Cut the pieces and drill two holes for the 1/2" PVC. Install the unit, lower the motor and use a dab of either PVC cement or  5 min Epoxy and let the unit dry. After it has dried, remove the unit, complete the bond with PVC cement and add more 5 min Epoxy. When all is cured and you have sanded and filed it to your liking, give it a good paint job. NOTE: The 4" long  piece of PVC only goes in a little ways, you only have 4 1/2"s clearance between the two trim rods.