They are good but I destroyed the first one with a hammer. I used standard spline pliers on the second and it came together fairly easily. I just opened my jaws as wide as I could and the rest was just a matter of making things nice and straight, then pushing, then pushing with both hands. I should have ordered 17mm instead of 18mm. Your measurements are correct - my guess was wrong so my jumpsuit is a bit difficult to close. Overall I am very satisfied and if I can do it, then so can you!
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