Vollrath E257 - Manual (Page 15)

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2.4 ADJUSTING CUP DISPENSERS
To adjust the cup dispensers, install the size cup desired
into the dispenser and turn the wing nuts on the dispenser
mounting bracket until enough tension is applied to the rim
of the cup to keep it from dropping out (Fig. 11). Do not over-
tighten the wing nuts.
WING NUTS
Figure 11
Adjusting Cup Dispensers