No grooves on either tenon or mortise. Stem is all vulcanite - actually included a pic of the tenon earlier. Yeah I always twist when inserting/removing stem, and it is possible to do this as per normal for the first 2/3 of the process, but this pipe needs a little knack for getting the stem inserted properly. I just assumed it was due to being an old pipe etc and needed a bit extra work, but after reading about the golfer on pitchforks first catalogue pic, I noticed the ‘push stem’ reference and I gently tried inserting the stem without a twist and it went in perfectly with ease.
either way I will continue to be extra careful as to preserve the condition of the pipe.
am I reading too much into the whole ‘push stem’ thing, and it is more a reference to not having a screw tenon?
Chur