Did you try looking around for a used Aluminum Cap? If you find one cheap enough, after you are done with it, take it to a Scrap Dealer and recoup some of your money.
A few times, I found them out in the country in somebody’s front yard while just taking a drive. I never paid more than $20.00 for one.
Take some C Clamps with you.
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My goal is to survive. Whatever the problem might be.