Old Log Cabin Pipe Works is open for orders. Limit 3 Forever Stems. Great addition to a Cob. Use them on my Mark Twain and other filtered Cobs. Converts to non-filter as a bonus.
I've experienced the same issueNot all of my cobs accept even MM replacement stems. They all seem to be too tight.
I can't speak for the Old Log Cabin stems, but the Walker stems needed some modifying depending on preference. I just stuck them in the pipes that fit each stem the best to start. There wasn't much modification needed for them to fit. I had do to a little heating, pushing, sanding, and waxing to get some of them just right; but was easy enough. I used to order the straight nosewarmer stems from Walker. I would file and sand the sides down to make more narrow bits, shaped the buttons on them to preference, and opened up the slots. It's what made my cobs into some of my most favorite and comfortable pipes today.I'm curious about how much modification might be needed with these?