Replacing the T15 Power Tube is really easy to do.
Just slide the 2 Boxjax sound dampeners down the tube to expose the Power Tube attachment point. Take a side cutter and snip the zip ties from both sides on the limbs and remove the old Power Tube from the limb nipples.
Move the Bowjaxs from the old Power Tube onto the new Power Tube.
Slide the new Power Tube onto the the limb nipples.
You want to use a little dish soap to help the tube slide on easier. Take the new zip ties and tighten them over the tube onto the limb nipples at the location where it necks down.
Use the side cutter again to remove the tail from the zip ties after tightening.
Slide the Bowjaxs back up and over the attachment point.