Bowflex LateralX LX5 Service Manual page 23

Second stage belt tension check
27. To test the Left Drive Belt tension:
On the upper part of the belt, twist the belt at the midpoint between the
pulleys. The belt should not twist more than 90 degrees (vertical).
If the tension is correct, go to Step 33.
If the tension is too loose, adjust. Continue to Step 28.
(arrow) two turns.
29. Use an M10 socket wrench to adjust the nylon lock nuts. If the tension
is too loose, tighten the nuts. If the tension is too tight, loosen the nuts.
NOTICE: Be sure to adjust the nuts on both sides evenly and turn
the nuts the same number of times.
23