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Review title: Great Way to Revive an Old Typewriter
Product review: A few years ago, I bought a 1929 Underwood No. 5 typewriter at a local antique shop. Shortly thereafter, a friend of mine gave me a portable Underwood typewriter. I've used this product on both of them in order to loosen up the keys (especially in the second one) with great success. I imagine it would also work well on a sewing machine, but I don't have one (yet), so I can't really comment. If you're looking for a nice, effective lubricant for small metal moving parts, though, I would recommend this product.
