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I did one headstud like that, welding a nut on. Actually I have done several stud removals like that, but only one headstud.
The biggest problem is getting the weld to bite on the stud. It helps to make a spot weld on the stud first so there is a good base to weld on to. Othervice the puddle likes to just attach to the nut. Drilling out half the nut with a large drill bit to get a big v-shape groove around the stud is another tip.
You may have to repeat this procedure before having success.
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
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