The FREE T Bucket plans

You can build your own hairpins from 7/8 DOM steel tubing. If you have a blower or lots of horsepower you will want to use 1 inch DOM )drawn over mandrel) tubing. You can use a harbor Freight pipe bender to bend the tubing. You have to cut the pieces longer than finished length to work in that style bender. Cut the end that has to be tapped 1 inch longer than the finished dimension, weld a small piece of scrap in that 1 inch area to grip in the vise so you won't get teeth marks on the finished piece. Use a large right angle drill and start with the bit that will just remove a little bit of material then keep changing bits until you get to the size required for the tap. Then, drill out that extra one inch with the bit size to match the OD of your tap. ONLY GO ONE INCH DEEP. This will allow you to start the tap in straight and get good threads. Then you can cut off that extra inch re drill with the correct size for the tap, finish tapping to the new length and have good straight threads. Any time drilling or tapping use plenty of tapping fluid or thread cutting oil; you can use a tubing notcher that you bolt to a steel table top and tack a piece of scrap angle iron so you can clamp the tubing at the right angle to cut the ends.