Re: 1924 Sport 136

Posted by Karl On 2024/1/12 8:31:06

The door locks were stiff. Decades of dirt and rust prevent the striker from being easily moved. The springs on the striker were so strong that the doors had to be slammed shut to close the doors. I disassembled the lock cases and blasted the parts with glass dust. After blasting, I brushed all parts with a special brush with very fine wires (OSBORN company). These brushes (diameter ~ 80mm) will be used industrially for brushing freshly manufactured aluminum rims. These brushes do not produce sparks and are therefore approved for this industrial work. They're not cheap. As it turned out, all cast metal parts can be brought into an optical condition after blasting that makes them appear as if they were freshly cast. This applies to aluminum, zinc, bronze but also blasted steel parts. It looks particularly good on carburettor housings (pott-cast or bronze). (To be seen later in the photos of the carburettor restoration). I also tried stainless steel brushes, brass brushes and fine steel brushes. None achieve a result like these OSBORN brushes. I had two weaker versions of the spiral spring that was much too strong made. One of them then let the doors slam shut with the “Packard typical” “.. click.. click” that I wanted. The visible parts of the lock box are polished. All other parts brushed and then nickel plated everything together. Here, too, I later use stainless steel screws for fastening, the heads of which I polish in the visible area. Polished stainless steel parts match the color of nickel-plated parts very well. Their color is more “yellowish” like nickel than “bluish” like chrome. This also saves me the endless search for the right nickel-plated or chrome-plated screws. After assembly, the previously riveted lock boxes can either be soldered with silver solder or, after appropriate preparatory work, they can be screwed together with countersunk screws. I had the door handles cast in brass (nickel-plated) according to the sample that I made myself and presented to the manufacturer.

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