Recently started a new summer night job cleaning buses. We use a potable backpack style battery powered vacuum. The annoying problem is that we need to be able to quickly switch from the floor attachment to the brush attachment to clean the seats. There is no easy way to hold the brush head and it has been forgotten a few times. The quick fix was to 3d print a clip that would hold the brush head onto the main shaft of the vacuum handle. It works great. There were a few designs on here that had the right idea but did not fit my liking, so i designed my own. Enjoy.
p.s. i have designed a "bonus" item. I drafted up a all-in-one brush head with built in clip that you can print if your brush head has replaceable and removable bristles. I have not tried printing this one yet, but it should work.