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Hi Tom,
I didn't have any problems but make sure you clean the sides and the top to bare metal ,so the weld will be penetrating the stud and the nut. Using a non galvinised nut is best(gives less splatter and toxic smoke). The washer is for protecting the spigot. The biggest trick was to get the washer and the nut level. I did hold the washer straight with pliers and made a small spot weld onto the stud and then placed the nut over the stud. I started filling up the gap around the stud and the oversized nut and then filled the nut till the top. By the time the socket fits over the nut, expansion from heat gone enough, I backed the nut with the stud out of the case. It worked well for me on my 8 broken studs so I did also all the other ones this way but higher up the stud. I also heated the spigot up with a torch for 15 min before starting this. You mean concern is to protect the cylinder base.
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