It was great until I helped a friend with a stuck screw, half of the ground section broke off, it still functions as a screwdriver and really keeps the cock screw tight I just cannot use it on lock screws anymore.
These patches are very consistent in thickness and weave. Like all commercial pre-cut patches they tend to unravel at the edges with a really tight ball-patch fit, which is why I always use patches that are one size larger than the manufacturer recommends.
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