Hi,
IMHO the notes are written for overly cautious beginners.
The more guardings the more problems the operator will have at work, because he must turn around.
Don 't know what do you want to print, but for jobs like leaflets, biz cards, numbering etc. you 'll be happy if you can get platen without hassle by any guarding. The front guarding is important cause it stops the machine immediately.
If you put a heavy fitted frame in and out hundred times a day, you don 't need a gym anymore...
The machine is rock solid but can act like a diva. Sometimes you 'll need much fingertip feeling.
And no , don 't know about papers about security, the model of machine is too old, it 's vintage.