Abstract: A spring compressor for axially compressing a helical coil spring of an automobile and then holding the spring in the compressed position consists of two identical devices mounted on opposite sides of the axial spring which is to be axially compressed. Each device comprises metal plates held together by rollers, the plates having curved hook formations to engage a coil of the spring. A threaded spindle fits into a housing capable of pivoting between these metal plates. A chain is threaded around the coils of the spring which is to be compressed and around the rollers between the metal plates. Threaded on the spindle is a chain adjustment piece through which the chain passes and which moves outwardly along the spindle when the spindle is turned, so as to cause the chain to pull the spring and compress the coils of the spring between the loop of chain and the curved hook formations of the metal plates.

Abstract: The invention provides a method of apparatus for refinishing a vehicle brake disc. The brake disc is rotated while in place on the vehicle and is brought into contact with one or more abrading discs, which are rotated as well, thereby grinding the brake disc. The abrading discs are maintained in contact with the brake disc by being mounted on a holder which is secured into a portion of the vehicle which is fixed with respect to the brake disc. The preferred arrangement is to attach the holder to the brake caliper mounting associated with the brake disc to be ground. In a preferred embodiment two abrading discs are used, and they can be adjusted to be slightly out of parallel with one another, so as to grind the brake disc with more pressure in a desired region than in another region.