hi folks can anyone recommend a tool for gettting into those hard to reach corners whilst sanding. there is some points i cant get too on my stair case ie pieces about 25-30 mm wide that i cant get sanded and also tiny little corners and triangles. ive looked at the black n decker mouse etc but it looks too big ive bought and loaned various sanders but some places are just to stubborn to get too. any advice will be welcome please