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get a stud connector
Ah, good idea.
I wouldn't bother to relieve the back to sit close to the tube. Welding will easily bridge the gap, and you won't lose any of the threads.
Ah, thanks for clearing that up. May still go for it: gives me an excuse to update my files and if its wonky, it'll be getting on my nerves.
If you're just doing a practical (rather than pretty) weld on job, I wouldn't bother to relieve the back to sit close to the tube. Welding will easily bridge the gap, and you won't lose any of the threads. A good close fit across the whole joint surface is only really necessary if you're brazing the lug onto the tube.
If you want lots of thread so that you have some length to play with to make it pretty, get a stud connector