my Sisterloctitian never used the Sisterlock tool for any of my retightenings. She's always used the Nappylocs Tool because she found it easier to use. I bought it a 5 years ago from Nappylocs. It costed $15 then. The owner was very nice and helpful. I have a small and a large tool. I used the small one more. I think it would be better if you purchased it in America, because it would be faster than coming from Germany. Also, my friend that i used to pay to retighten my hair, she started her own locks and her husband made a tool for her out of a paperclip. I sent her all the youtube links about what to use to lock the hair. can you believe that people even use safety pins, hair pins...quite creative. good for them. it's all on youtube. so please check out www.nappylocs.com or email me at firstname.lastname@example.org if you're not able to get it from them for whatever reason.