The wall of the tube is too thin to tap. You might get 1 thread and the bolt will push right thru that when the steering arm contacts it. Drilling the tube will create a weak spot for it bend too. I have their tubular arms on my '67 Camaro, but have never driven it since install. I do have PS, but I will be looking into this and see if there is a way to weld a piece of angle iron to the tube for the steering arm to contact. Yep, it will mess up the powder coating, but it may be the only, safe, solution.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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