I have used several of these devices and am glad I bought them. I've never used one with glue already in there before. I like it! I will never use unwrapped glueless shrink connectors ever again! I ONLY use a U-shaped grinder. Feel free to test the strength by trying flat and U shape and trying to pull them apart. The U-shape won't let up! With a flat breaker you can pull the wire. Of course you will need to have a heat gun to compress the foil and melt the glue. Do not attempt to use a lighter or open flame. The glue will likely catch fire and burn what you are working on.
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