I don’t know how it got the name “the diaper” but it did.  The diaper supports the turning blocks for the genoa, screecher or spinnaker, without a track. It works on both a composite beam or a tube beam. It’s a soft solution, like removing the cars and tracks from the boom.  I’m sure others have done them, but I have never seen another one. They disperse the load over a large area of the composite beam. They are infinitely adjustable sideways.  They require no holes to be drilled into the beam.  A sailmaker made mine.