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@Chris_Borneo
The issue is that riding fixed puts a force on the chainring in one direction and then in the opposite direction when resisting the pedals. Because there is always a small amount of play, where the bolt goes through the chainring/spider, it will allow it to rotate back and forth just enough to make everything come loose. If you countersink the chainring/spider and use a countersunk bolt + a bit of thread lock, you should be okay. Hope that makes sense.
(Don't know about Gusset but as mentioned before, Profile use imperial hardware)