Cheap Photography Studio Backdrop Mount

Step 5 Saw, see?

Using your hacksaw or some similar implement of destruction, saw your PVC pipe in half, so you'll have two identical 5' lengths with eyescrews embedded in one end of each. Then, join the two halves by sticking em into the PVC coupling (the bits that were in the middle should go into the coupling, not the ones with the eyeholes).
The reason for this is so if you are using rolls of seamless photography backdrop paper you will be able to break the shaft in twain easily to change out the rolls.