![]() ![]() ![]() Make sure to carefully dry the baseplate or part you’ve been working on because the solution is water-based. But no worries, it’ll be completely gone in a couple of times. You’ll have to rinse and repeat because each time you’ll only remove the corroded top layer of the screw. Scratch the corroded metal with the mending needle and remove it with some Rodico or peg wood. The black corroded layer of the stuck screw is very obvious. The alum solution should have corroded the top layer of the broken screw. Remove the part from the solution and examine it. Plunge the part with the broken screw in the alum solution and leave it for about a day. Also, carbon steel is magnetic and stainless steel isn’t. This might help: stainless steel has a luster and carbon steel is quite dull. Make sure you know which metal the crown is made of if you need to remove a broken winding stem from a crown. Please note that some crowns are also made of carbon steel so the alum will ruin them. For example, if the broken screw is inside the baseplate, make sure to remove parts like the set lever screw. Alum won’t corrode stainless steel but it’ll corrode carbon steel. I suppose you could buy a block of alum and grind it but I bought a container of alum powder from the internet.īefore you continue, make sure to remove as many parts as possible. Mix as much alum powder with the water as it will hold. ![]() Something to scratch, like a mending needleīroken balance screw that is stuck in the base plate.There’s a trick to removing a broken screw without using special tools. I don’t, for example, because I don’t often need them and they’re expensive.īut I’ve some good news. However, not everybody has access to these tools. Sure, you could use a drill to drill out the broken screw or use a screw extractor. Have you ever had a watch movement with a broken screw? Or an original signed crown (case parts are often harder to find than movement parts) with a piece of a broken winding stem inside? ![]()
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