jimi are you certain of that
rh is the left hand thread wind . tightens anticlockwise to the rear
use your thread gauge to check the shells threads . you do have a thread gauge dont you ?
cover the threads in the shell with grease so it looks smooth and butt the bb up against it and rotate the wrong way until it clcks so you know the threads are aligned , screw in until you feel the resistance and then unwind . look at the point were the grease was removed and where it still is and look for any sign of galling of the threads or any other possible reason it becomes difficult at that point
if its made in japan itl have the correct threads
if you cant see any reason why it wont go in take it to a lbs you trust and see if they will chase the threads for you but they might be reluctant as its ti
"It also has a seat. I don’t use it, but you probably will for the first few years until you build up the muscle."