So I have two rba's now and they both require different sized coils. Instead of drill bits and blunt tipped gauges, I found an exceptional and extremely affordable solution! I figured I should pay it forward and share with you guys and gals. The best part is, for the many of you who don't use credit cards, you can easily buy an Amazon card at your local pharmacy or grocery store where they keep gift cards. It's totally worth it! 
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Amazon.com: Budget 2 Piece Mandrel Set - Wire Looping Tool - 10 Different Diameters
Product Description
Create uniform and consistent loops in your wire work. These Mandrels are Carbon steel with precise steps for different sizing. Small mandrel can make loops in 1.5, 2, 3, 4, and 5mm Large mandrel can make loops in 6, 7, 8, 9, and 10mm Non-Slip Rubber handle for ease of use. We always recommend wearing protective eye-wear when working with tools. Each mandrel is 5.5 inches total length. You will receive a package with two mandrels.
: Amazon.com: Budget 2 Piece Mandrel Set - Wire Looping Tool - 10 Different Diameters
Product Description
Create uniform and consistent loops in your wire work. These Mandrels are Carbon steel with precise steps for different sizing. Small mandrel can make loops in 1.5, 2, 3, 4, and 5mm Large mandrel can make loops in 6, 7, 8, 9, and 10mm Non-Slip Rubber handle for ease of use. We always recommend wearing protective eye-wear when working with tools. Each mandrel is 5.5 inches total length. You will receive a package with two mandrels.
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