In my experience with SMA materials, the speed to contract is not the same as the speed to expand (one direction will be much slower). In practice, this means

In my experience with SMA materials, the speed to contract is not the same as the speed to expand (one direction will be much slower). In practice, this means that there might be a time delay from one shift to the next in a case where the material now needs to go in the opposite direction. Can you shift all the way to the top and then back down without any delays between shifts?