Install stulls inside partially cured concrete pipes.
What does a Stull Installer do?
Installs stulls inside partially cured concrete pipes to maintain round contour of pipes during curing process: Saws boards to specified length, using table saw. Nails crosspiece to end of each board. Inserts first stull at one end of pipe to span diameter and wedges stull ends tightly in place, using hammer and wedges. Wedges two more stulls crosswise to first stull and nails stulls together at intersection. Installs additional stulls in same manner at center and opposite end of pipe.