Over the past few weeks, we've had several of our antique table lamps re-wired. It started with on of our lamps being quite a challenge to turn on. We would have to turn the switch to just the right point in order for the bulb to come on, which would usually take several turns.
I discovered that this means that the switch is bad and can be a fire hazard because the lamp may be on when the bulb isn't illuminated.
A more obvious sign that it is time for updates is a tattered cloth cord with exposed wiring.
Another trick to determine if your cord should be replaced is to bend it in half. If you see cracks form in the bend, it's probably time to update.
We've been replacing our old cloth and vinyl cords with new cloth cords. The reproduction cloth versions come in various colors (my local antique light repairman had a selection of brown, gold and white in his shop).
In addition to updating the cords and plugs, we've also updated bad switches with new three-way switches. I honestly had never considered this before, but it was an option that I thought we'd try. Now that most of our table lamps are three-way lights, I absolutely love the versatility it offers in the lighting a room.
The cost of updating a table lamp has run us between $25 and $35 each, depending on how much gets updated. The cost is well worth it for the peace of mind that safety brings, along with the added aesthetic benefit of the lighting versatility.