I only have one, but I love this Ferndown. I was a little worried when I bought this estate, but hadn't yet smoked it (Christmas gift, wasn't opened until Christmas Day). Why did the owner sell it, was the mount a problem? On opening the box, the stem fitment was a little loose. But, after one smoke, it is as snug as my vulcanite stemmed pipes and a great smoker.
From what I've learned, this stem was developed for use by military pipe smokers who could quickly disassemble the pipe during battle.