Portable surface preparation abrading unit

A portable surface preparation abrading unit, said abrading unit comprising in combination a workhead housing adapted to support a rotationally driven abrading means, a removable plurality of workhead housing assembly screws to enable disassembly of said workhead housing, a removable abrading unit mandrel upon which said rotationally driven abrading means is insertably assembled within said workhead housing, a drive key having a drive key roll pin insertably engaging a mandrel shaft drive slot within said removable abrading unit mandrel at a drive end thereof, a set screw threadably adjustable within an axially aligned mandrel shaft threaded opening at a idler end of said removable abrading unit mandrel to compressively engage an abrading unit retention roll pin within an elongated slot therewithin to in turn compressively engage said rotationally driven abrading means insertably assembled thereon, an idler key roll pin insertably engaging a mandrel shaft idler slot within said removable abrading unit mandrel at the idler end thereof, a flexible drive shaft interconnecting said rotationally driven abrading means from the removable abrading unit mandrel drive end thereof to a remote power source, and a vacuum conduit interconnecting said workhead housing to an auxiliary vacuum conduit intake connectably communicating with an auxilliary vacuum conduit of a vacuum source.