why in maccos when it is talking about hilchos shobbas and ripping the stitch on the neck hole of a tunic and opening a barrel stopper does rav yehuda hold that you can't rip the thread of the tunic but we know you can open a barrel stopper? what's the difference halachically
Learnerpro, I'm not sure if you are bothered by a specific problem, but simply:
A stitch is meant to combine two pieces of fabric permanently and the 2 sides of the stitch become 1 entity. The barrel cover's adhesive doesn't combine it into 1 entity with the barrel since it is meant to be removed. So you didn't create a new opening in the barrel, you just messed up the cover.