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There are structural fittings for use with steel tubing. The tubing is all the same size, the difference with EMT (Electrical Metal Tubing) is that the insides are ground and finished so as to not cause damage to the wire insulation. Strctural tubing is not, and there are places that sell fittings for structural tubing.


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I would use a wire brush to clean them. Take a magnet and find if they are brass or plated steel , then you can be aggressive with the brush if they are solid brass. New brass plating could only be applied by a sophisticated commercial shop; It requires plating with two metals ( copper and zinc) at the same time.


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A right angle disk grinder with an abrasive disk will work for the task you describe. Expect to see the abrasive disk slowly reduce in diameter at first, then more quickly as it gets smaller. This is an aspect of the abrasive material sacrificing itself to move steel. To prevent destruction of the disk, it is important for it to remain in the plane of the ...


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Since the surface is already painted I would not use a primer but getting that loose paint off will be important or the same will happen to this coat of paint. You could use a paint scraper or corse sandpaper to help clean the loose stuff up but I would use an angle grinder with a wire brush , I use cup brushes with twisted wire to clean even badly rusted ...


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I'll disagree with (most of) the comments above and say just file it. You are removing a small amount of material, you don't want to remove too much, and it won't take very long to do each one. Without crafting some sort of jig you're far more likely to overdo it on at least some of the handles with a powered approach, and/or to make the result un-square. I ...


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The usual routine is to scrape, brush, and sand until all loose material is off, then prime and paint (or use a self-priming paint). In this case it's not clear whether there's a bonding problem with the black coating or whether it's just very old and neglected. It's possible that if you do this job without a complete strip to bare metal (or the white ...


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EMT conduit comes in straight sections; I presume you'll be making the bends yourself. Then the reamed-out black pipe tee can work: you just have to slide it onto the EMT before the second bend is made so that the tee becomes captive in the correct section of tubing. You can make a hidden connection by passing threaded rod through the EMT. Threaded rod is ...


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Prep is a hard science NASA operates the Kennedy Space Center at Cape Canaveral, Florida, also known as the “Cape who picked this location, Nikita Khrushchev?” NASA being NASA, they’ve done staggering amounts of research on care of millions of tons of steel latticework in ocean-washed salt-marsh Florida. Many books written, and they even have a website ...


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It is "mill varnish" . Difficult to find out what exactly it is because different mills use different stuff and change from time to time; assuming it is relatively new steel. Big purchasers will tell the mill not to put it on if they are going to paint the steel, it is a nuisance to remove. Once you clean off the varnish you still have the mill ...


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Red or black oxide is essentially a primer. It does help prevent rust a bit in the short term. I'd degrease, sand a bit if needed, re-prime, and paint. No need to strip the steel bare.


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