One thing that may help your binding pushrods is to remove the metal rod from the tube and apply 2 heavy coats of automotive paste wax. Any brand will do. This works great for lubing many tupes of sliding parts. It lasts a really long time and wont attract dust like a grease or oil will. Also make sure the rods are not binding because of poor alignment. You can sometimes bend them a little so they enter and exit the guide tube straighter and relieve the stress. Jeff