I also have a problem with my Lawson mouthpieces. I rarely separate rim from
cup, but have had trouble each time i tried. Here is what worked for me. Boil
some water in a small pan, then grasp mouthpiece by the insertion end and hold
it in the water ONLY RIM DEEP. After a minute or so, tap the rim with a rawhide
hammer and then try unscrewing it, using one of those thin rubber grip pads
normally used for stuck jar lids. This will not only give you a better grip,
but will protect your hand from the hot rim.
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