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JMA 6 gauge universal mortice keys

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Ongoing problem.Raised this issue with T Colledge & Son of Bristol.Was informed that they have tried numerous sources of supply and have found them all to be lacking in accuracy of guage.Ie, they order 6 guage but when checked with a locksmith pin/pipe guage they are found to be 6.5 guage.Attitude of key manufacturers does leave a lot to be desired on this problem.Able to use a Guardian 6 guage(which is a 6 guage) to extricate myself out of some situations but as still got some limitations.Any successful supplier/stockist information would be appreciated.

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