Some people have taken to using disposable razors to shave the ridge off
I tried a disposable razor for this without much luck. Mind you it was a used one, next time perhaps I should use a new one?
Japanese made tubes have gone the way of Japanese made consumer electronics..
Alas I think you're right. I checked out the Michelin seamless ones from Amazon and if the reviews are to be believed some people have had bad luck with them. Also the stems don't come with dustcaps, are threadless and seem to a bit on the short side. The one and only time I got a tube from Walmart (Sorry
I was desperate and couldn't find a bike shop) it had a very short stem but it did have a dustcap, fortunately my wheels aren't very aero so it worked. As tubes go it wasn't noticeably bad. I thought the short stem was Chinese cost paring but someone has told me it was a standard length meant for non aero wheels.