If it says Made in Ireland, it was made before 1949 (1915-1949). the tight fit is partially just the way they are made back then. I have noticed vintage pipes usually have tighter tenons, just because they were made to closer tolerances than today. If the bit is tight, but it in the freezer for a while before trying to remove the bit. I usually rub a little candle wax on the tenon to make it easier to assemble. Sometimes there is an accumulation of 'gunk' inside the shank which makes it tightUse a qtip soaked in alcohol to rub inside the shank. if it comesout black you have tar build up which you canremove to give a less tight fit.