I know all of that and whopping amounts more. They use plastic to make long airplane wings now, but it like the gun does not apply to your problem. There being probably 5000 different plastic compounds.
Go ahead and run it with no bolt there, I dare you. You'll spin that bearing in minutes. Your stuff anyway and do as you will with it, I was trying not to be mean like I said but you embarrass yourself with the more you say. Like the 'main' thing. It means main cap bolt and you missed that entirely, it being a heavy stressed bolt that will likely pull epoxy threads like they aren't even there. $40-$50 dollar bit? I buy them for $5 at the hardware store. Epoxy bolt? I laughed at that when the stumps bought epoxy and I sold it, not ONE TIME did the proposed idea ever work, most people are lost on the proper application of epoxy to hold long term, they haven't a clue like here of the properties it has.
I have welded aluminum and it can be done, just not the way you posited. I did it on race engine heads going at $10,000 apiece and it worked fine.
I told you what to do there and you can't get rid of the 1500 other things banging around in your head to see it, a repair costing you literally pennies and more reliable if done correctly than the rest of the work you would likely do on the engine. I have stressed that type repair at 10X what you will see in your case with no failure. THAT skill is the one you don't have, to be able to weed out the worse methods to go with the one most likely to work BEFORE you butcher your stuff chasing it.
When like that luck is all you have left and I will wish you that. Past that I'm am done with bothering you, I really don't enjoy it and you cannot hold higher ideas in your head due to too much garbage in it.
