Make sure it's as straight as possible and weld some balancing weights to the outside back edge of the spiral.
You can do this without balancing machinery by spinning it between two bearings and heat shrinking the high points with a blowtorch, then pouring water on to shrink the pipe in at the heat point.
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.