To facilitate the grinding process in hard-to-reach places, you can make a convenient nozzle for a drill of small size. To change the abrasive when it is worn or when another graininess is needed, Velcro is glued to the surface of the site.
The craft consists of a homemade steel plate, a long bolt with a nut, a piece of rubber and Velcro. All layers are glued together with glue, the head of the bolt is recessed in rubber and does not interfere with work.
The nozzle on the drill should be made of such a diameter so that it is not larger than the width of the strip of abrasive, which is sold in the store. From the standard strip of sandpaper you can get several circles of the desired size.