Kudos to Astro-Pneumatic for reaching out to me and quickly sending out two replacements.
I'm glad they sent TWO tools because one worked OK and the other performed poorly.
The main issue I had is in getting the prongs to open wide enough to fit over the end of the valve stem. I was able to fiddle the the tool enough that I did eventually manage to get ONE of the grabbers to work but it still took what I consider a bit of force and effort before it functioned as described.
At least this set was able to grab the stem and retract as they're supposed too.
Granted it's a new tool and hopefully with a bit of time and use the prongs will open up a bit more and slide over the end of the stem easier.
The thing is, I don't see myself using it often enough for that to ever happen.
I want to like this tool, I really do. I tried both "grabbers" that Astro-Pneumatic graciously sent me on a couple of different Kendra bike tubes. Each tube had slightly different valve cores.
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One of the tools performed well right out of the packaging while the other took some time to "break in" and was clunky to operate.
I marked the one the worked well with a red paint pen.
Perhaps if I was changing valve cores all day in the dessert I could find more value in this tool but for now I'm going to stick with my $2 Milton 2-in-1 valve core tool because it simply works effortlessly without any fussing around.
I'm really impressed with the great customer service; but sadly, not the tool.