No more tangled chains
One can still keep his jewelry so carefully, sometimes very fine tend chain to knot or tangle. Unraveling then becomes a tedious task.
With a little trick you can easily prevent this: Take a drinking straw made of plastic and shorten it, if necessary to half the length of the chain. Now thread the chain through the blade and close the chain lock. If you have a chain with a pendant, this of course remains on the "outside".
