This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
It is often required to fix the horn head of a walking stick or umbrella to au iron screw dowel that is firmly fixed in the stick itself, the joint being covered by a silver band. As a rule, the hole in the horn handle has worn too large for the dowel screw to grip, and if so a new screw of larger gauge is necessary. Screw the horn on the screw first. If the screw is tight aud there seems danger of splitting the horn, warm the screw in a flame and screw home whilst hot, and then immediately immerse in cold water. There is no cement that will make a firm joint. A wooden plug might be tried, but it will be difficult to get the old screw into it, as the plug will probably wind out. Fill the silver mount with wax cement or sealing wax, and screw the handle up tight whilst the wax is fluid.
 
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