Time-Certs are indeed the way to go.
Porsche even uses them for broken head bolts. I had 2 broken bolts on the bracket which holds the front sway bar and discovered this when I installed my M030 Front Sway bar.
I had a discount service coupon for the dealership, 1 Hr. Labor for $45, and so was able to have them drill it out and insert the time certs for less $$ than I would have spent on the tool and certs alone - the only time another mechanic has ever touched my car - nerve wracking to say the least.
They did the work in an hour and the lead tech who did the work said that it was just as strong if not stronger with the time cert than originally.
Cheers!
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