Perfect straightness is difficult to obtain in a natural product like wood.
Step 1: Sight down barre to determine apex of the warp.
Step 2: Center the 4’ level on the apex and secure the level to the barre (using tape, tie, etc) as shown in the diagram.
Step 3: Attempt to slide the 3/16” drill bit into the gap.
Step 4: If the drill bit slides freely and completely through the gap, then the barre is beyond our warp tolerance. Immediately call Alvas for return instructions.