Rhin-O-Tuff OD 3500, Instruction Book

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d) Placing the book onto the comb.
Place the holes of the book on the fingers of the comb. A slight rotating of the
book will help guide the holes onto the comb. Return the opener handle to
close the comb into the book. The binding process is now complete.
e) Margin setting
The margin on a standard comb die is fixed at 3/32”. This margin will work
fine until you bind books up to about 1" in comb size. After that, there is too
little paper between the edge of the hole and the edge of the sheet. Tearing of
a sheet out of the book can occur when handling the book to rough. It is
recommended when binding books beyond this size you use the optional
variable backstop comb die.