They do it just to piss us off, I have one machine with ORFS all over it! Totally unnecessary, I have newer machines with BSP.....all out of the same stable!totally with you on that one James .... 95% of ports are BSP anyway .... bloody metric is a complete PITFA
Here you - one end pulled out and butt plug insertedAs a minimum stick a photo of the ends on here before ordering, so everyone can disagree as to what you have!!!
Here you go......27mm? Think routy just got too precise