Sounds like your probably ok. With the through bolts the tangs hang on I sometimes use locknuts but generally either stake the nut or most often drill the nut and pin it in place with a small cotter pin. This is to ensure that there is really only one position where things line up correctly and so hopefully later down the road well meaning people with wrenches don't just tighten it like crazy. Of course I also make sure that the threads themselves aren't bearing on the extrusion - just solid shank.
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