Unfortunately I just tried one of these extensions. I originally received them as a gift to give as a gift but I needed them very quickly so I went for them. As you can see from the photo, extension cords do not fit most pencils. In fact I only have one pencil that fits, no cap or eraser. These are very few pencils. I bought another extension from Amazon, same type but different design and it fits all my pens including crayons (which also don't fit). Unfortunately, the 30-day refund has already expired. The only way to accomplish this is to remove the piece completely, then insert the pin into the extension, and then slide the other piece over the pin. If your pencil is long enough you're fine, but if your pencil is a stub that has to be taken out to sharpen from time to time, then you're screwed. There is a better product for the same price and I've been using it for a month now with no problems.
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