Picture of repairing a zipper (cheap)
In this instructable I'll try to explain how I fix a zipper.
Take a look at the picture below what do you see, yes a broken zipper. The zipper isn't attached to the fabric anymore. This happens very often (at least to me). The thread from the zipper wheres off after a while, and the zipper detaches.
You might ask why I repair it myself? Well the answer is simple, it's cheap and fast.
It's cheap because you don't need someone else to fix it for you.
It's fast because you don't need to wait weeks before your zipper is repaired. 
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Step 1: What you will need

Picture of what you will need
You won't need much.
What you'll need:
- needle (it needs to be thin enough to fit through the zippers' teeth)
- thread (doesn't need to some sort of super strong thread)
- small scissor
- the blue thing in the picture (you don't really need it)

Step 2: Step 1: cleaning up

Picture of step 1: cleaning up
3 (5).JPG
The first step will be removing the old worn-out thread.
If you don't remove the old thread, sewing the zipper back on will become more difficult.
Pull the thread away but make sure you don't go any further then needed. You don't want to detach more.
At the end remove the thread by cutting it off.

Step 3: Step 2: the thread

Picture of step 2: the thread
4 (2).JPG
For the length of the thread I multiplied the length of the detached zipper by five.
My zipper was detached for about 2cm.
I needed 10cm of thread.
When you have your yarn measured, try to get it through the needle (this is probably the hardest step of all).
Dandie2 years ago
Good and helpful idea. Thanks.
SkinnE3 years ago
Ahh... so those boots, packs and other things I have sat in a pile with separated zippers can be saved.  Many thanks for this helpful instructable.  I didn't realise the coils were sewn on like that.  My only criticism is the sewing instructions are not terribly clear.  I think I have the sequence though: one 'loop' to start, then under-over until the end where you finish with another 'loop'. 
diy_bloke3 years ago
the blue thing is a Seam ripper