I was looking into getting other 10.9 grade bolts that are not fully threaded and see if they are a good replacement. I read about 12.9 grade but some people pointed out that they can actually be more brittle than 10.9 so might not be a good candidate for this application. I think there was a picture on here also that showed where the bolt broke and it's not the head area so not really sure a non fully thread bolt is going to help that much. But I will be ordering some parts soon so I will report back if the bolts I found works or not. There was another member that was looking into designing a bracket also.
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