Hi, Squirrel;
I don't know much Japanese, but it appears to me that the coins are there to counterbalance the weight of the gun barrel thingies so the guns don't fall off. I can't tell if they are intended to swivel, but if they are, it would be very important that they be balanced.
There are various programs that will extract text from pdf files, some of them freely downloadable, so that might be the way to go if you really get stuck.
I hope this helps.
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