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Drjim,
Your door bars are to be welded in?
Consider the advice in the MSA Blue Book ( C9c) Competitors safety, para 25) about the embrittling effect of excess heat on the steel used for roll cages. Get a pro-welder to do the job, rather than DiY?
Also the section on door bars, C(c) para 20: "...may be removeable". So a suitable fixing clamp is acceptable without welding. Also, "The side protection must be as high as possible but not more than one half of the total height of the door aperture measured from its base."
John
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