I always called them Twist Clamps but I like the sound of Center pull C clamp better.
The term was used by a young guy who first showed me this type of clamp. I later became skeptical when the same guy corrected me on the term 'fitch.' He said the lettering brush is called a 'finch,' not a fitch. I thought he was kidding, but he was serious. I said, "Shawn are you sure you're not confusing a brush with a bird? There's no 'n' in the word." He just scowled and said, "Look it up."
So, the term "center pull C clamp" may be totally wrong. But I still don't what the real name is. You are the first person I have met (besides my machinist brother-in-law) that has even seen them before. They are a little pricey. You won't see them at Harbor Freight. I like them because they don't try to "walk" when you try to clamp two glued pieces together. They pinch equally from both sides.
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I like Tim Toad's go-fund-me idea. I should put it on my blog. It
will help pay for the pacemaker I got in August.
I got a nice one, Bluetooth enabled. I am supposed to sleep within ten feet of the base unit so it can collect data and send it securely to....somewhere. My smart phone is not supposed to be in the same room with the base unit, but I don't know why.
I have some other restrictions, too.
For example, the nurse giving me instructions said, "Don't operate an electric tool next to your chest."
"Okay, I'll stop sanding my shirts."
She did not even smile. And then, "Don't operate a jackhammer at all. Ever."
"Okay."
"And for four weeks, don't raise your arm above your head and don't lift more than five pounds. No exerting!."
Also, "and tell airport security before you go through the metal detector."
That makes sense.
She knew I cycled, but I was still taken aback when she asked, "What kind of handlebars do you have?"
I said, "Uh, straight bars. On both bikes."
"Good, she said. No drop-down handlebars. It's stretching too much. You can pull a wire out of your heart."
"Oh, my gosh!"
"Later, when you're healed more, you can ride what you want."
I said, "No problem. I don't ride racing bicycles, anyway. I'm a old guy."
"Good," she said."
"What about triathlons?" I asked, tongue-in-cheek.
She said, "Have you not been listening to me?"