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Do you think filing the groves open wide to accept a wrench handle or something with a bit more meat will be bad for it? Seems to seal on the flat of the pipe where the clamp will be and not the end anyways?

that'll work but if it starts to distort I'd grab the torch as they get locked there pretty tight. the orig thin grooves are narrow as it doesn't take much torque to screw them in on the assembly line when they're new.

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