With the ATD cover removed and nothing disturbed, the arrow is visible (may need a torch) With the rod in place, arrow pointing up, undo the nut, turn the engine to your set up and redo the nut up. There seems to be about 6 to 8 degrees engine movement on the shaft with the rod in place. I have just done mine today and going for 32 degrees and the rod is free to drop in and out. Haven't tried it yet.