That is a nice photo of a Grappler. You might be interested in a thread by a member about these. Evidently the link that adjusts the pliers is fairly easily broken. He posted some good ideas on the subject. These seem to be pricey on the sales sites. I don't know if that is speculative pricing with regards to the relative scarcity, or the demand for these things actually supports the prices.
I hate to see a new member's post go unanswered. Best wishes. G