Use this stick in conjunction with our other motor mount systems to alter the up/down thrust adjustment by 4 degrees. We made these stick because we built a twin tractor canard Slow Stick and in this configuration, you actually need a small amount of "UP" thrust to acheive good cruise to glide elevator trim settings. Our stock twin tractor motor mount adjusts from zero to -8 degrees (as most of our motor mounting systems do). This part changes the range of existing motor mount systems to "+4 to -4" or "-4 to -12" degree thrust line. Each Item is 2 motor sticks. SKU Number: RRCSSMMSTKPLUS4