The button that keeps the bristle part locked when using the Dyson combination accessory tool broke and the bristle part wouldn't stay in place.  I found a replacement part online but it didn't look right so I recreated the broken button in fusion 360 and the print came out excellent.  The button requires a spring and I still had the original spring so I used it.  I printed in grey PETG.  This combination tool came with my Dyson V11 stick vacuum but I think its the same tool used in a bunch of Dyson stick vacuums.  My button had a little piece that stuck out and into the grooves on the tool that lock it into place.  The part I found online didn't have that so there must be variations of the tool.