My nilfisk is a bit old now but I know it's the same as the str machines so can you still get the vac systems for them by any chance ?
Just been told that the Nilfisk 510B is no longer being made, so parts are going to be less and less available, same as the STR701 model I presume
Nilfisk 510b and the 701 are the same except from the handle pole, you will always get parts from schwamborn, is that board made from wood?
Look on the schwamborn site they do a ring type tat fits onto there other machines with a hole for the vacuum hose, your buffer just sits in it.