I am uncertain if it is safe. What I do know...you are missing more than just a handle pivot as the whole pliers spring unit is also missing. From what I see on my copy...the handle pivots play no part in stopping the pliers other than to possibly keep them a certain distance apart for the internals to work. You must have the back pivot in place, otherwise, the whole tool would fall apart. I know the spring in these is fairly strong. Not sure how that would play with only 1 pivot point. I suppose you could always repair it by placing another similar sized nut and bolt to hold the two handles together more securely. My suggestion is to pass this one up if you haven't already got it. These do come up from time to time, and patience might be the better option...that is unless you don't mind a bit of DIY repair.