Picture of Bike Lock from Laptop Security Cable
This is a simple and short instructable to make a cable bike lock/bike lock extender from a disused laptop secutiry lock cable, like this.
A number of these laptop security cables were donated to my local hackspace in Nottingham UK (www.nottinghack.org.uk).
I needed a cable extender for my bike lock, which can be used to lock all the wheels (similar to this kind of lock).

The problem with the laptop security lock is that only one end had a loop. To make it useful I needed a loop on both ends which could not be undone.
So this is the technique I used to create one....
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Step 1: Parts Required

Picture of Parts Required
You will need:
Laptop secutiry cable
Section of thick-ish walled steel tube (I used a section from a childs bike frame)
Self-amalgamating tape or large section heatshrink

Tools required:
Hacksaw with metal cutting blade
Large cable crimper (needs to be around 120mm2). This can be either handheld or hydraulic. You will only need this for a minute or so so maybe ask someone who does battery cable lugs?..

Step 2: Cut tube

Picture of Cut tube
Using the metal hacksaw, cut a piece of steel tube. I used a scrapped steel bike frame which was about 2mm wall thiuckness and around 25mm diameter. It must be wide enough to have two runs of cable going through it, but also small enough to fit into the crimpers.
I cut around 30mm long piece. I was trying to match the other end, but this was a test so I didnt measure it too well....
3366carlos2 years ago
nice, where did u buy the crimper?
chunkyhampton (author)  3366carlos2 years ago
I already had the crimper as I use it to do lugs on battery cables.
But I think I got it from ebay originally.
Search for 'indent crimper' and you will find some, like this (random) one:
I've not used a hydraulic crimper, but they may do a better job.
Hope that helps.