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Hello,
Sisterlocks is a trademarked brand of lock. Only people who recieve special training are able to offer Sisterlocks. Basically they are a lock which is typically very small. I have seen them as small as 1/2 of the diameter of a pencil (mature size) but they also make them larger so they look more like traditional locks. Installation can be pretty pricey. In my area it averages about $500-$600. The cost of maintenance (sp) depends on your consultant. Sometimes they can charge and hourly fee, or they may offer a flat rate. It is possible to maintain one's own Sisterlocks, however you must pay to take a class on how to retighten them and you are supposed to wait 6 months after they are installed to take the class. There are quite a few people, however, who just figure it out on their own and maintain their Sisterlocks themselves pretty much from day one. That's about as much as I know. Their website, sisterlocks.com offers much more information.
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