Step 5: Select the Heights for your Hose Reels
2) With your trusty allen wrench in hand slide the top stop collar to your mark and set the allen screw to hold it. The hose reel's bottom U-Bolt will rest and rotate upon the stop collar.
3) I recommend that you finish all the steps necessary to mount the top reel to the pole, including loading the garden hose on it, before you decide where you want the bottom reel height to be.
NOTE: You can set and change the hose reel heights at any time. The above process will just make it easier based upon setting the top or highest one first.