I had my TV on a fully articulated wall mount and wanted to add a large soundbar. To get the direction of the sound right, I thought it must be mounted on the same mount as the TV, so they could swivel together.
Imagine my frustration when after buying the soundbar adapter I found out that the distance between the sound bar’s mounting holes is much larger than what the Kanto mount could accommodate.

Fortunately, nothing is a problem for too long if you have SOLIDWORKS and a 3D printer. 

I designed a bracket that surrounds the smaller metal bracket and requires no screws to be secured to it. A clever peg ensures that the weight of the soundbar keeps everything in place.