Originally Posted by
JohnDThompson
If you can't dislodge that tube, you could use a traditional loose-ball bottom bracket instead of a cartridge.
Or... a hollow spindle two-piece crank (a la hollowtech II) with external bearings (I prefer standardized ISO notch pattern). The spindle will be 24 mm diameter, should fly right through that metal tube. These cranks are available generic brand on amazon (low cost including bearings and rings, and good quality), in various BCD patterns (I like 5x110 mm), and in road or mtb Q-factor (pedal spacing, road is more narrow than mtb).