If you need to make a booklet, you need a long reach stapler. These can cost several times more than a standard desk stapler. The office where I work now has one shown here. A few years ago I was working in an office where there was no money for a long reach stapler, but we needed to make booklets.
The long reach stapler shown here is really heavy duty with very strong components. Someone did tape corrugated cardboard pieces to the steel base for stops on different sizes of paper.
Step 1: Choose the Stapler
You need a donor stapler that lends itself to the necessary modifications. A Bostitch-Stanley desk stapler like the one shown here works well. This photo is from Bostitch-Stanley.
Step 2: Remove the plastic base
A new longer wooden base will be used. Pry the old plastic base off of the stapler. It is the black part shown along the bottom portion of the graphic. You will not be needing it, so do not worry about any damage inflicted, although it should snap right off with ease.
Step 3: Begin remaking
Grind the head from the pin that is the axis for the stapler. Here it is the filled black circle at the right end of the graphic. Remove the stapler from its steel base and cut the steel base off with a saw at the red line in the graphic.
Step 4: Turn part of the steel base around
After sawing the steel base where shown in the last step, turn the portion at the rear of the stapler around