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Not only are the number of threads per inch different, and the threads tapered, but the cutting depth of the die tool (coarse thread) are greater than the thickness of the tube (normally).
Often the wrong tool plays an important part in what trashes a bike.
Most classic bikes have 24 tpi but older Westfield bikes (~pre 1933) and some English bikes often have 26 tpi.
$16.99 on Amazon. I recently bought one and I use large channel lock pliers to turn it because it is much larger than the die holder in my regular tap and die set. Works great!
If you have threaded one before you can ignore the rest of this message..... Once you have the proper tools(not a pipe threader as already mentioned)be sure to use cutting oil, it's a must. Only cut a small portion of thread at a time, maybe a quarter of turn on the die or less. Use a back and forth motion, allowing the cut metal to escape and be careful, go slow and don't heat up the steer tube because it will expand, cutting the threads deeper and destroy your project.
Any experts certainly chime in.
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