There is plenty you can do in the corkscrew workshop. Everything from cleaning away light surface rust to replacing a dusting brush. It's a matter of opinion what is acceptable in terms of corkscrew restoration but basic repairs that include replacing a broken worm & broken handle with a period replacement seem to be acceptable.
Bone handles from period direct pulls in good condition can be used to bring a good more valuable antique corkscrew with a broken handle back to life.
Simple period finger pull corkscrews with threaded worms can be removed with a copious amount of WD40 or for those of you that prefer a bit more danger, a blow torch will soon loosen up ceased up threads. Beware grip marks!! Note, threads come in a variety of diameters, so there is no guarantee the worm you have in mind will fit. Tap & dies can help you overcome this problem.
Removing some light rust & a general clean
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A very sharp blade like a craft knife or Stanley knife is ideal for removing light rust & even lumpy more stubborn pieces of rust. Run the blade smoothly across the rusty area with care not to dig into to the surface
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Very fine gauge wire wool is particularly good at cleaning very light surface rust & tarnish. I generally add some bees wax & clean both the steel & the wooden handle this way.
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Once applied, leave for 10 minutes or so & then buff up with a duster.
A corkscrew with light wear can
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be transformed into a beauty using this easy three step technique.
Personally, I'm very thoughtful as to what I clean & what I don't. I'm very conscious of avoiding ruining the antique patina. Basic iron & steel bows, finger pulls & direct pulls with steel shanks & worms are generally the best choices for this process.
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