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Never seen one of those. It's basically a big safety pin that goes through the one of the links of the chain, right?I use a 4in Stainless Steel Promar Snap-Hook to secure my high intensity strobe to my anchor line and it holds well and never slips... Even in low vis I can see that strobe from quite a distance when navigating back back to the boat. Might also work for your purpose.
The procedure I teach is to get neutral when you arrive at your gas switch depth, you’ll be looking at your computer to arrive there already, the buddy/team is your reference, one can hold the stop and be the reference while at the same time watching/validating the buddy gas switch, so, check depth and match that to cylinder MOD, do gas switch (won’t detail procedure here) and last step before reg goes in your mouth is check depth one last time, all of this is less than 1 minute to perform.
It is a bad idea, if that’s what you’d be dependent on, you’d be left without resources if/when the anchor line is taken away, which can happen often here in Florida, I’ve seen it come lose before it was intended to a few times, and many times we prefer to do hot drops and drift deco, so no anchor line at all. On drift deco you’d have your SMB up on a reel, so that can be a reference, but again, whats the plan if you have a problem with it, or current is ripping? Not being dependent on a visual reference is a better strategy imo.
I have that clip on my Jon line, they come in various sizes, but the larger ones are easier to use.
