I broke my bottom bracket axle a few days ago, and when I removed the crankarms I discovered my old bike is using a cup and cone bottom bracket but more importantly the bracket shell is a bit odd. It is not threaded, the left cup is stuck or glued to it and goes all the way until the right side of the shell. On the right side it is threaded and allows the right cup to be screwed in it. I have included a few pics.
First pic is the left side of the shell, the broken axle is still there, you can see an hexagonal piece that screws around the left cup to secure it to the shell I guess, although the left cup is already firmly glued to the shell and doesn't really move.
Second pic is the left cup naked. You can see a little space between the shell and the cup all around it. And how it goes all the way until the right side of the shell.
Third pic is the right side of the shell. The left cup seems more firmly attached to the shell on this side. There seems to be some glue between the cup and the shell. The inside of the cup is threaded to allow for screwing the right cup.
Have you ever seen that kind of system? Is it safe? I was planning to clean the cup, clean the bearings (maybe throw some new ones), grease and replace the bearings, put a new axle, close and seal everything, and finally screw the crank arms. Is this the correct procedure to replace this kind of bottom bracket?