Duplo DB-250 User Manual

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(C) Left-end round / hollow middle
LL = RL, RR = LR
OR
You have to do the adjustment for the clamps. Slightly loosen the left-side
bottom lock nuts, then gradually tighten the left bottom screws of the clamps
until there is no gap between the spine and the nipping plate surface when you
close the clamps. Make some books to see if the spine has been improved on left
side.
(D) Right-end round / hollow middle
LL = RL, RR = LR
OR

Duplo DB-250 Specifications

General

Brand	Duplo
Model	DB-250
Category	Binding Machine
Language	English